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Let A = $\begin{pmatrix} 3 & -3 \\ 7 & 5 \end{pmatrix}$ and B = $\begin{pmatrix} -4 & -4 \\ -5 & 5 \end{pmatrix}$ . What is the entry in row 1, column 2 of A + B?
Let A = $\begin{pmatrix} 2 & 0 \\ 6 & 2 \end{pmatrix}$ . What is the entry in row 2, column 1 of 3A?
A shop records sales in a matrix with one row for each of its 4 stores and one column for each of 7 days. What are the dimensions of the matrix?
1. 4 × 7
2. 7 × 4
3. 28 × 1
A shop records sales in a matrix with one row for each of its 2 stores and one column for each of 6 days. What are the dimensions of the matrix?
1. 2 × 6
2. 6 × 2
3. 12 × 1
A shop records sales in a matrix with one row for each of its 4 stores and one column for each of 6 days. What are the dimensions of the matrix?
1. 4 × 6
2. 6 × 4
3. 24 × 1
A shop records sales in a matrix with one row for each of its 3 stores and one column for each of 7 days. What are the dimensions of the matrix?
1. 3 × 7
2. 7 × 3
3. 21 × 1
A shop records sales in a matrix with one row for each of its 2 stores and one column for each of 7 days. What are the dimensions of the matrix?
1. 2 × 7
2. 7 × 2
3. 14 × 1
A shop records sales in a matrix with one row for each of its 3 stores and one column for each of 6 days. What are the dimensions of the matrix?
1. 3 × 6
2. 6 × 3
3. 18 × 1
A shop records sales in a matrix with one row for each of its 2 stores and one column for each of 8 days. What are the dimensions of the matrix?
1. 2 × 8
2. 8 × 2
3. 16 × 1
A shop records sales in a matrix with one row for each of its 5 stores and one column for each of 7 days. What are the dimensions of the matrix?
1. 5 × 7
2. 7 × 5
3. 35 × 1
A shop records sales in a matrix with one row for each of its 2 stores and one column for each of 9 days. What are the dimensions of the matrix?
1. 2 × 9
2. 9 × 2
3. 18 × 1
A shop records sales in a matrix with one row for each of its 4 stores and one column for each of 8 days. What are the dimensions of the matrix?
1. 4 × 8
2. 8 × 4
3. 32 × 1
A shop records sales in a matrix with one row for each of its 5 stores and one column for each of 8 days. What are the dimensions of the matrix?
1. 5 × 8
2. 8 × 5
3. 40 × 1
A shop records sales in a matrix with one row for each of its 3 stores and one column for each of 8 days. What are the dimensions of the matrix?
1. 3 × 8
2. 8 × 3
3. 24 × 1
A shop records sales in a matrix with one row for each of its 5 stores and one column for each of 9 days. What are the dimensions of the matrix?
1. 5 × 9
2. 9 × 5
3. 45 × 1
A shop records sales in a matrix with one row for each of its 4 stores and one column for each of 9 days. What are the dimensions of the matrix?
1. 4 × 9
2. 9 × 4
3. 36 × 1
A shop records sales in a matrix with one row for each of its 3 stores and one column for each of 9 days. What are the dimensions of the matrix?
1. 3 × 9
2. 9 × 3
3. 27 × 1
A shop records sales in a matrix with one row for each of its 5 stores and one column for each of 6 days. What are the dimensions of the matrix?
1. 5 × 6
2. 6 × 5
3. 30 × 1
Let A = $\begin{pmatrix} 4 & 2 \\ 3 & -2 \end{pmatrix}$ and B = $\begin{pmatrix} 7 & 9 \\ 5 & 4 \end{pmatrix}$ . What is the entry in row 1, column 1 of AB?
Let A = $\begin{pmatrix} 8 & 8 \\ 8 & 4 \end{pmatrix}$ and B = $\begin{pmatrix} 2 & 3 \\ 3 & 2 \end{pmatrix}$ . What is the entry in row 2, column 1 of AB?
A is a 2 × 5 matrix and B is a 5 × 8 matrix. What are the dimensions of AB?
1. 2 × 8
2. 5 × 5
3. AB is not defined
A is a 4 × 5 matrix and B is a 5 × 8 matrix. What are the dimensions of AB?
1. 4 × 8
2. 5 × 5
3. AB is not defined
A is a 4 × 6 matrix and B is a 6 × 7 matrix. What are the dimensions of AB?
1. 4 × 7
2. 6 × 6
3. AB is not defined
A is a 3 × 5 matrix and B is a 5 × 9 matrix. What are the dimensions of AB?
1. 3 × 9
2. 5 × 5
3. AB is not defined
A is a 2 × 6 matrix and B is a 6 × 9 matrix. What are the dimensions of AB?
1. 2 × 9
2. 6 × 6
3. AB is not defined
A is a 3 × 6 matrix and B is a 6 × 8 matrix. What are the dimensions of AB?
1. 3 × 8
2. 6 × 6
3. AB is not defined
A is a 3 × 5 matrix and B is a 5 × 8 matrix. What are the dimensions of AB?
1. 3 × 8
2. 5 × 5
3. AB is not defined
A is a 3 × 5 matrix and B is a 5 × 7 matrix. What are the dimensions of AB?
1. 3 × 7
2. 5 × 5
3. AB is not defined
A is a 3 × 6 matrix and B is a 6 × 7 matrix. What are the dimensions of AB?
1. 3 × 7
2. 6 × 6
3. AB is not defined
A is a 2 × 6 matrix and B is a 6 × 8 matrix. What are the dimensions of AB?
1. 2 × 8
2. 6 × 6
3. AB is not defined
A is a 4 × 5 matrix and B is a 5 × 7 matrix. What are the dimensions of AB?
1. 4 × 7
2. 5 × 5
3. AB is not defined
A is a 4 × 6 matrix and B is a 6 × 8 matrix. What are the dimensions of AB?
1. 4 × 8
2. 6 × 6
3. AB is not defined
A is a 2 × 6 matrix and B is a 6 × 7 matrix. What are the dimensions of AB?
1. 2 × 7
2. 6 × 6
3. AB is not defined
A is a 2 × 5 matrix and B is a 5 × 7 matrix. What are the dimensions of AB?
1. 2 × 7
2. 5 × 5
3. AB is not defined
A is a 4 × 5 matrix and B is a 5 × 9 matrix. What are the dimensions of AB?
1. 4 × 9
2. 5 × 5
3. AB is not defined
A is a 4 × 6 matrix and B is a 6 × 9 matrix. What are the dimensions of AB?
1. 4 × 9
2. 6 × 6
3. AB is not defined
A is a 3 × 6 matrix and B is a 6 × 9 matrix. What are the dimensions of AB?
1. 3 × 9
2. 6 × 6
3. AB is not defined
A is a 2 × 5 matrix and B is a 5 × 9 matrix. What are the dimensions of AB?
1. 2 × 9
2. 5 × 5
3. AB is not defined
What is the determinant of $\begin{pmatrix} -2 & -5 \\ 8 & 4 \end{pmatrix}$ ?
Let A = $\begin{pmatrix} 5 & 3 \\ 1 & 8 \end{pmatrix}$ . What is the entry in row 1, column 1 of the inverse of A?
For which value of k does $\begin{pmatrix} k & 3 \\ 10 & 2 \end{pmatrix}$ have no inverse?
Let A = $\begin{pmatrix} 9 & 2 \\ 3 & 6 \end{pmatrix}$ . What is the first component of A $\begin{pmatrix} -3 \\ -1 \end{pmatrix}$ ?
The matrix $\begin{pmatrix} 0 & -1 \\ 1 & 0 \end{pmatrix}$ maps the point (8, 0) to (0, 8) and (0, 8) to (−8, 0). Which transformation does it represent?
1. A rotation of 90° counterclockwise about the origin
2. A reflection in the line y = x
3. A rotation of 90° clockwise about the origin
The matrix $\begin{pmatrix} 0 & -1 \\ 1 & 0 \end{pmatrix}$ maps the point (4, 0) to (0, 4) and (0, 4) to (−4, 0). Which transformation does it represent?
1. A rotation of 90° counterclockwise about the origin
2. A reflection in the line y = x
3. A rotation of 90° clockwise about the origin
The matrix $\begin{pmatrix} 0 & -1 \\ 1 & 0 \end{pmatrix}$ maps the point (7, 0) to (0, 7) and (0, 7) to (−7, 0). Which transformation does it represent?
1. A rotation of 90° counterclockwise about the origin
2. A reflection in the line y = x
3. A rotation of 90° clockwise about the origin
The matrix $\begin{pmatrix} 0 & -1 \\ 1 & 0 \end{pmatrix}$ maps the point (6, 0) to (0, 6) and (0, 6) to (−6, 0). Which transformation does it represent?
1. A rotation of 90° counterclockwise about the origin
2. A reflection in the line y = x
3. A rotation of 90° clockwise about the origin
The matrix $\begin{pmatrix} 0 & -1 \\ 1 & 0 \end{pmatrix}$ maps the point (3, 0) to (0, 3) and (0, 3) to (−3, 0). Which transformation does it represent?
1. A rotation of 90° counterclockwise about the origin
2. A reflection in the line y = x
3. A rotation of 90° clockwise about the origin
The matrix $\begin{pmatrix} 0 & -1 \\ 1 & 0 \end{pmatrix}$ maps the point (1, 0) to (0, 1) and (0, 1) to (−1, 0). Which transformation does it represent?
1. A rotation of 90° counterclockwise about the origin
2. A reflection in the line y = x
3. A rotation of 90° clockwise about the origin
The matrix $\begin{pmatrix} 0 & -1 \\ 1 & 0 \end{pmatrix}$ maps the point (9, 0) to (0, 9) and (0, 9) to (−9, 0). Which transformation does it represent?
1. A rotation of 90° counterclockwise about the origin
2. A reflection in the line y = x
3. A rotation of 90° clockwise about the origin
The matrix $\begin{pmatrix} 0 & -1 \\ 1 & 0 \end{pmatrix}$ maps the point (5, 0) to (0, 5) and (0, 5) to (−5, 0). Which transformation does it represent?
1. A rotation of 90° counterclockwise about the origin
2. A reflection in the line y = x
3. A rotation of 90° clockwise about the origin
The matrix $\begin{pmatrix} 0 & -1 \\ 1 & 0 \end{pmatrix}$ maps the point (2, 0) to (0, 2) and (0, 2) to (−2, 0). Which transformation does it represent?
1. A rotation of 90° counterclockwise about the origin
2. A reflection in the line y = x
3. A rotation of 90° clockwise about the origin
A shape with an area of 2 square units is transformed by the matrix $\begin{pmatrix} 2 & 2 \\ 2 & 3 \end{pmatrix}$ . What is the area of the image?
Which matrix equation represents the system 4x + 5y = 18 and 4x + 2y = 35?
1. $\begin{pmatrix} 4 & 5 \\ 4 & 2 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 18 \\ 35 \end{pmatrix}$
2. $\begin{pmatrix} 4 & 4 \\ 5 & 2 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 18 \\ 35 \end{pmatrix}$
3. $\begin{pmatrix} 4 & 5 \\ 4 & 2 \end{pmatrix}\begin{pmatrix} 18 \\ 35 \end{pmatrix}$ = $\begin{pmatrix} x \\ y \end{pmatrix}$
Which matrix equation represents the system 9x + 9y = 13 and 2x + 4y = 10?
1. $\begin{pmatrix} 9 & 9 \\ 2 & 4 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 13 \\ 10 \end{pmatrix}$
2. $\begin{pmatrix} 9 & 2 \\ 9 & 4 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 13 \\ 10 \end{pmatrix}$
3. $\begin{pmatrix} 9 & 9 \\ 2 & 4 \end{pmatrix}\begin{pmatrix} 13 \\ 10 \end{pmatrix}$ = $\begin{pmatrix} x \\ y \end{pmatrix}$
Which matrix equation represents the system 6x + 2y = 32 and 6x + 4y = 39?
1. $\begin{pmatrix} 6 & 2 \\ 6 & 4 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 32 \\ 39 \end{pmatrix}$
2. $\begin{pmatrix} 6 & 6 \\ 2 & 4 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 32 \\ 39 \end{pmatrix}$
3. $\begin{pmatrix} 6 & 2 \\ 6 & 4 \end{pmatrix}\begin{pmatrix} 32 \\ 39 \end{pmatrix}$ = $\begin{pmatrix} x \\ y \end{pmatrix}$
Which matrix equation represents the system 3x + 6y = 40 and 5x + 4y = 29?
1. $\begin{pmatrix} 3 & 6 \\ 5 & 4 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 40 \\ 29 \end{pmatrix}$
2. $\begin{pmatrix} 3 & 5 \\ 6 & 4 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 40 \\ 29 \end{pmatrix}$
3. $\begin{pmatrix} 3 & 6 \\ 5 & 4 \end{pmatrix}\begin{pmatrix} 40 \\ 29 \end{pmatrix}$ = $\begin{pmatrix} x \\ y \end{pmatrix}$
Which matrix equation represents the system 4x + 9y = 16 and 6x + 7y = 25?
1. $\begin{pmatrix} 4 & 9 \\ 6 & 7 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 16 \\ 25 \end{pmatrix}$
2. $\begin{pmatrix} 4 & 6 \\ 9 & 7 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 16 \\ 25 \end{pmatrix}$
3. $\begin{pmatrix} 4 & 9 \\ 6 & 7 \end{pmatrix}\begin{pmatrix} 16 \\ 25 \end{pmatrix}$ = $\begin{pmatrix} x \\ y \end{pmatrix}$
Which matrix equation represents the system 5x + 6y = 12 and 5x + 5y = 23?
1. $\begin{pmatrix} 5 & 6 \\ 5 & 5 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 12 \\ 23 \end{pmatrix}$
2. $\begin{pmatrix} 5 & 5 \\ 6 & 5 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 12 \\ 23 \end{pmatrix}$
3. $\begin{pmatrix} 5 & 6 \\ 5 & 5 \end{pmatrix}\begin{pmatrix} 12 \\ 23 \end{pmatrix}$ = $\begin{pmatrix} x \\ y \end{pmatrix}$
Which matrix equation represents the system 7x + 6y = 19 and 9x + 6y = 27?
1. $\begin{pmatrix} 7 & 6 \\ 9 & 6 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 19 \\ 27 \end{pmatrix}$
2. $\begin{pmatrix} 7 & 9 \\ 6 & 6 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 19 \\ 27 \end{pmatrix}$
3. $\begin{pmatrix} 7 & 6 \\ 9 & 6 \end{pmatrix}\begin{pmatrix} 19 \\ 27 \end{pmatrix}$ = $\begin{pmatrix} x \\ y \end{pmatrix}$
Which matrix equation represents the system 7x + 2y = 12 and 6x + 4y = 27?
1. $\begin{pmatrix} 7 & 2 \\ 6 & 4 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 12 \\ 27 \end{pmatrix}$
2. $\begin{pmatrix} 7 & 6 \\ 2 & 4 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 12 \\ 27 \end{pmatrix}$
3. $\begin{pmatrix} 7 & 2 \\ 6 & 4 \end{pmatrix}\begin{pmatrix} 12 \\ 27 \end{pmatrix}$ = $\begin{pmatrix} x \\ y \end{pmatrix}$
Which matrix equation represents the system 8x + 3y = 12 and 5x + 7y = 11?
1. $\begin{pmatrix} 8 & 3 \\ 5 & 7 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 12 \\ 11 \end{pmatrix}$
2. $\begin{pmatrix} 8 & 5 \\ 3 & 7 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 12 \\ 11 \end{pmatrix}$
3. $\begin{pmatrix} 8 & 3 \\ 5 & 7 \end{pmatrix}\begin{pmatrix} 12 \\ 11 \end{pmatrix}$ = $\begin{pmatrix} x \\ y \end{pmatrix}$
Which matrix equation represents the system 2x + 2y = 11 and 9x + 9y = 11?
1. $\begin{pmatrix} 2 & 2 \\ 9 & 9 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 11 \\ 11 \end{pmatrix}$
2. $\begin{pmatrix} 2 & 9 \\ 2 & 9 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 11 \\ 11 \end{pmatrix}$
3. $\begin{pmatrix} 2 & 2 \\ 9 & 9 \end{pmatrix}\begin{pmatrix} 11 \\ 11 \end{pmatrix}$ = $\begin{pmatrix} x \\ y \end{pmatrix}$
Which matrix equation represents the system 9x + 7y = 35 and 3x + 8y = 32?
1. $\begin{pmatrix} 9 & 7 \\ 3 & 8 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 35 \\ 32 \end{pmatrix}$
2. $\begin{pmatrix} 9 & 3 \\ 7 & 8 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 35 \\ 32 \end{pmatrix}$
3. $\begin{pmatrix} 9 & 7 \\ 3 & 8 \end{pmatrix}\begin{pmatrix} 35 \\ 32 \end{pmatrix}$ = $\begin{pmatrix} x \\ y \end{pmatrix}$
Which matrix equation represents the system 2x + 5y = 26 and 6x + 2y = 30?
1. $\begin{pmatrix} 2 & 5 \\ 6 & 2 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 26 \\ 30 \end{pmatrix}$
2. $\begin{pmatrix} 2 & 6 \\ 5 & 2 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 26 \\ 30 \end{pmatrix}$
3. $\begin{pmatrix} 2 & 5 \\ 6 & 2 \end{pmatrix}\begin{pmatrix} 26 \\ 30 \end{pmatrix}$ = $\begin{pmatrix} x \\ y \end{pmatrix}$
Which matrix equation represents the system 4x + 2y = 32 and 3x + 9y = 18?
1. $\begin{pmatrix} 4 & 2 \\ 3 & 9 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 32 \\ 18 \end{pmatrix}$
2. $\begin{pmatrix} 4 & 3 \\ 2 & 9 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 32 \\ 18 \end{pmatrix}$
3. $\begin{pmatrix} 4 & 2 \\ 3 & 9 \end{pmatrix}\begin{pmatrix} 32 \\ 18 \end{pmatrix}$ = $\begin{pmatrix} x \\ y \end{pmatrix}$
Which matrix equation represents the system 5x + 2y = 30 and 4x + 3y = 22?
1. $\begin{pmatrix} 5 & 2 \\ 4 & 3 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 30 \\ 22 \end{pmatrix}$
2. $\begin{pmatrix} 5 & 4 \\ 2 & 3 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 30 \\ 22 \end{pmatrix}$
3. $\begin{pmatrix} 5 & 2 \\ 4 & 3 \end{pmatrix}\begin{pmatrix} 30 \\ 22 \end{pmatrix}$ = $\begin{pmatrix} x \\ y \end{pmatrix}$
Which matrix equation represents the system 8x + 7y = 18 and 4x + 4y = 11?
1. $\begin{pmatrix} 8 & 7 \\ 4 & 4 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 18 \\ 11 \end{pmatrix}$
2. $\begin{pmatrix} 8 & 4 \\ 7 & 4 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 18 \\ 11 \end{pmatrix}$
3. $\begin{pmatrix} 8 & 7 \\ 4 & 4 \end{pmatrix}\begin{pmatrix} 18 \\ 11 \end{pmatrix}$ = $\begin{pmatrix} x \\ y \end{pmatrix}$
Which matrix equation represents the system 8x + 7y = 33 and 3x + 8y = 14?
1. $\begin{pmatrix} 8 & 7 \\ 3 & 8 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 33 \\ 14 \end{pmatrix}$
2. $\begin{pmatrix} 8 & 3 \\ 7 & 8 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 33 \\ 14 \end{pmatrix}$
3. $\begin{pmatrix} 8 & 7 \\ 3 & 8 \end{pmatrix}\begin{pmatrix} 33 \\ 14 \end{pmatrix}$ = $\begin{pmatrix} x \\ y \end{pmatrix}$
Which matrix equation represents the system 7x + 9y = 36 and 5x + 8y = 26?
1. $\begin{pmatrix} 7 & 9 \\ 5 & 8 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 36 \\ 26 \end{pmatrix}$
2. $\begin{pmatrix} 7 & 5 \\ 9 & 8 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 36 \\ 26 \end{pmatrix}$
3. $\begin{pmatrix} 7 & 9 \\ 5 & 8 \end{pmatrix}\begin{pmatrix} 36 \\ 26 \end{pmatrix}$ = $\begin{pmatrix} x \\ y \end{pmatrix}$
Which matrix equation represents the system 6x + 9y = 16 and 6x + 9y = 32?
1. $\begin{pmatrix} 6 & 9 \\ 6 & 9 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 16 \\ 32 \end{pmatrix}$
2. $\begin{pmatrix} 6 & 6 \\ 9 & 9 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 16 \\ 32 \end{pmatrix}$
3. $\begin{pmatrix} 6 & 9 \\ 6 & 9 \end{pmatrix}\begin{pmatrix} 16 \\ 32 \end{pmatrix}$ = $\begin{pmatrix} x \\ y \end{pmatrix}$
Which matrix equation represents the system 7x + 8y = 15 and 4x + 6y = 32?
1. $\begin{pmatrix} 7 & 8 \\ 4 & 6 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 15 \\ 32 \end{pmatrix}$
2. $\begin{pmatrix} 7 & 4 \\ 8 & 6 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 15 \\ 32 \end{pmatrix}$
3. $\begin{pmatrix} 7 & 8 \\ 4 & 6 \end{pmatrix}\begin{pmatrix} 15 \\ 32 \end{pmatrix}$ = $\begin{pmatrix} x \\ y \end{pmatrix}$
Which matrix equation represents the system 3x + 2y = 26 and 8x + 4y = 20?
1. $\begin{pmatrix} 3 & 2 \\ 8 & 4 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 26 \\ 20 \end{pmatrix}$
2. $\begin{pmatrix} 3 & 8 \\ 2 & 4 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 26 \\ 20 \end{pmatrix}$
3. $\begin{pmatrix} 3 & 2 \\ 8 & 4 \end{pmatrix}\begin{pmatrix} 26 \\ 20 \end{pmatrix}$ = $\begin{pmatrix} x \\ y \end{pmatrix}$
Which matrix equation represents the system 4x + 3y = 28 and 6x + 9y = 29?
1. $\begin{pmatrix} 4 & 3 \\ 6 & 9 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 28 \\ 29 \end{pmatrix}$
2. $\begin{pmatrix} 4 & 6 \\ 3 & 9 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 28 \\ 29 \end{pmatrix}$
3. $\begin{pmatrix} 4 & 3 \\ 6 & 9 \end{pmatrix}\begin{pmatrix} 28 \\ 29 \end{pmatrix}$ = $\begin{pmatrix} x \\ y \end{pmatrix}$
Which matrix equation represents the system 7x + 8y = 19 and 9x + 5y = 33?
1. $\begin{pmatrix} 7 & 8 \\ 9 & 5 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 19 \\ 33 \end{pmatrix}$
2. $\begin{pmatrix} 7 & 9 \\ 8 & 5 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 19 \\ 33 \end{pmatrix}$
3. $\begin{pmatrix} 7 & 8 \\ 9 & 5 \end{pmatrix}\begin{pmatrix} 19 \\ 33 \end{pmatrix}$ = $\begin{pmatrix} x \\ y \end{pmatrix}$
Which matrix equation represents the system 7x + 2y = 18 and 6x + 2y = 37?
1. $\begin{pmatrix} 7 & 2 \\ 6 & 2 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 18 \\ 37 \end{pmatrix}$
2. $\begin{pmatrix} 7 & 6 \\ 2 & 2 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 18 \\ 37 \end{pmatrix}$
3. $\begin{pmatrix} 7 & 2 \\ 6 & 2 \end{pmatrix}\begin{pmatrix} 18 \\ 37 \end{pmatrix}$ = $\begin{pmatrix} x \\ y \end{pmatrix}$
Which matrix equation represents the system 6x + 4y = 34 and 4x + 7y = 19?
1. $\begin{pmatrix} 6 & 4 \\ 4 & 7 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 34 \\ 19 \end{pmatrix}$
2. $\begin{pmatrix} 6 & 4 \\ 4 & 7 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 34 \\ 19 \end{pmatrix}$
3. $\begin{pmatrix} 6 & 4 \\ 4 & 7 \end{pmatrix}\begin{pmatrix} 34 \\ 19 \end{pmatrix}$ = $\begin{pmatrix} x \\ y \end{pmatrix}$
Which matrix equation represents the system 7x + 5y = 13 and 9x + 6y = 28?
1. $\begin{pmatrix} 7 & 5 \\ 9 & 6 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 13 \\ 28 \end{pmatrix}$
2. $\begin{pmatrix} 7 & 9 \\ 5 & 6 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 13 \\ 28 \end{pmatrix}$
3. $\begin{pmatrix} 7 & 5 \\ 9 & 6 \end{pmatrix}\begin{pmatrix} 13 \\ 28 \end{pmatrix}$ = $\begin{pmatrix} x \\ y \end{pmatrix}$
Which matrix equation represents the system 8x + 5y = 13 and 7x + 7y = 20?
1. $\begin{pmatrix} 8 & 5 \\ 7 & 7 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 13 \\ 20 \end{pmatrix}$
2. $\begin{pmatrix} 8 & 7 \\ 5 & 7 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 13 \\ 20 \end{pmatrix}$
3. $\begin{pmatrix} 8 & 5 \\ 7 & 7 \end{pmatrix}\begin{pmatrix} 13 \\ 20 \end{pmatrix}$ = $\begin{pmatrix} x \\ y \end{pmatrix}$
Which matrix equation represents the system 9x + 8y = 16 and 4x + 2y = 27?
1. $\begin{pmatrix} 9 & 8 \\ 4 & 2 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 16 \\ 27 \end{pmatrix}$
2. $\begin{pmatrix} 9 & 4 \\ 8 & 2 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 16 \\ 27 \end{pmatrix}$
3. $\begin{pmatrix} 9 & 8 \\ 4 & 2 \end{pmatrix}\begin{pmatrix} 16 \\ 27 \end{pmatrix}$ = $\begin{pmatrix} x \\ y \end{pmatrix}$
Which matrix equation represents the system 3x + 9y = 17 and 3x + 4y = 34?
1. $\begin{pmatrix} 3 & 9 \\ 3 & 4 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 17 \\ 34 \end{pmatrix}$
2. $\begin{pmatrix} 3 & 3 \\ 9 & 4 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 17 \\ 34 \end{pmatrix}$
3. $\begin{pmatrix} 3 & 9 \\ 3 & 4 \end{pmatrix}\begin{pmatrix} 17 \\ 34 \end{pmatrix}$ = $\begin{pmatrix} x \\ y \end{pmatrix}$
Which matrix equation represents the system 2x + 6y = 21 and 9x + 8y = 12?
1. $\begin{pmatrix} 2 & 6 \\ 9 & 8 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 21 \\ 12 \end{pmatrix}$
2. $\begin{pmatrix} 2 & 9 \\ 6 & 8 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 21 \\ 12 \end{pmatrix}$
3. $\begin{pmatrix} 2 & 6 \\ 9 & 8 \end{pmatrix}\begin{pmatrix} 21 \\ 12 \end{pmatrix}$ = $\begin{pmatrix} x \\ y \end{pmatrix}$
Which matrix equation represents the system 4x + 7y = 28 and 9x + 4y = 25?
1. $\begin{pmatrix} 4 & 7 \\ 9 & 4 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 28 \\ 25 \end{pmatrix}$
2. $\begin{pmatrix} 4 & 9 \\ 7 & 4 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 28 \\ 25 \end{pmatrix}$
3. $\begin{pmatrix} 4 & 7 \\ 9 & 4 \end{pmatrix}\begin{pmatrix} 28 \\ 25 \end{pmatrix}$ = $\begin{pmatrix} x \\ y \end{pmatrix}$
Which matrix equation represents the system 8x + 4y = 40 and 5x + 3y = 15?
1. $\begin{pmatrix} 8 & 4 \\ 5 & 3 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 40 \\ 15 \end{pmatrix}$
2. $\begin{pmatrix} 8 & 5 \\ 4 & 3 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 40 \\ 15 \end{pmatrix}$
3. $\begin{pmatrix} 8 & 4 \\ 5 & 3 \end{pmatrix}\begin{pmatrix} 40 \\ 15 \end{pmatrix}$ = $\begin{pmatrix} x \\ y \end{pmatrix}$
Which matrix equation represents the system 7x + 9y = 12 and 3x + 3y = 39?
1. $\begin{pmatrix} 7 & 9 \\ 3 & 3 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 12 \\ 39 \end{pmatrix}$
2. $\begin{pmatrix} 7 & 3 \\ 9 & 3 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 12 \\ 39 \end{pmatrix}$
3. $\begin{pmatrix} 7 & 9 \\ 3 & 3 \end{pmatrix}\begin{pmatrix} 12 \\ 39 \end{pmatrix}$ = $\begin{pmatrix} x \\ y \end{pmatrix}$
Which matrix equation represents the system 9x + 4y = 14 and 4x + 6y = 36?
1. $\begin{pmatrix} 9 & 4 \\ 4 & 6 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 14 \\ 36 \end{pmatrix}$
2. $\begin{pmatrix} 9 & 4 \\ 4 & 6 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 14 \\ 36 \end{pmatrix}$
3. $\begin{pmatrix} 9 & 4 \\ 4 & 6 \end{pmatrix}\begin{pmatrix} 14 \\ 36 \end{pmatrix}$ = $\begin{pmatrix} x \\ y \end{pmatrix}$
Which matrix equation represents the system 6x + 3y = 38 and 6x + 2y = 18?
1. $\begin{pmatrix} 6 & 3 \\ 6 & 2 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 38 \\ 18 \end{pmatrix}$
2. $\begin{pmatrix} 6 & 6 \\ 3 & 2 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 38 \\ 18 \end{pmatrix}$
3. $\begin{pmatrix} 6 & 3 \\ 6 & 2 \end{pmatrix}\begin{pmatrix} 38 \\ 18 \end{pmatrix}$ = $\begin{pmatrix} x \\ y \end{pmatrix}$
Which matrix equation represents the system 2x + 5y = 25 and 7x + 8y = 37?
1. $\begin{pmatrix} 2 & 5 \\ 7 & 8 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 25 \\ 37 \end{pmatrix}$
2. $\begin{pmatrix} 2 & 7 \\ 5 & 8 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 25 \\ 37 \end{pmatrix}$
3. $\begin{pmatrix} 2 & 5 \\ 7 & 8 \end{pmatrix}\begin{pmatrix} 25 \\ 37 \end{pmatrix}$ = $\begin{pmatrix} x \\ y \end{pmatrix}$
Which matrix equation represents the system 7x + 3y = 26 and 2x + 3y = 37?
1. $\begin{pmatrix} 7 & 3 \\ 2 & 3 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 26 \\ 37 \end{pmatrix}$
2. $\begin{pmatrix} 7 & 2 \\ 3 & 3 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 26 \\ 37 \end{pmatrix}$
3. $\begin{pmatrix} 7 & 3 \\ 2 & 3 \end{pmatrix}\begin{pmatrix} 26 \\ 37 \end{pmatrix}$ = $\begin{pmatrix} x \\ y \end{pmatrix}$
Which matrix equation represents the system 8x + 5y = 19 and 4x + 3y = 36?
1. $\begin{pmatrix} 8 & 5 \\ 4 & 3 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 19 \\ 36 \end{pmatrix}$
2. $\begin{pmatrix} 8 & 4 \\ 5 & 3 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 19 \\ 36 \end{pmatrix}$
3. $\begin{pmatrix} 8 & 5 \\ 4 & 3 \end{pmatrix}\begin{pmatrix} 19 \\ 36 \end{pmatrix}$ = $\begin{pmatrix} x \\ y \end{pmatrix}$
Which matrix equation represents the system 8x + 2y = 30 and 7x + 2y = 32?
1. $\begin{pmatrix} 8 & 2 \\ 7 & 2 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 30 \\ 32 \end{pmatrix}$
2. $\begin{pmatrix} 8 & 7 \\ 2 & 2 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 30 \\ 32 \end{pmatrix}$
3. $\begin{pmatrix} 8 & 2 \\ 7 & 2 \end{pmatrix}\begin{pmatrix} 30 \\ 32 \end{pmatrix}$ = $\begin{pmatrix} x \\ y \end{pmatrix}$
Which matrix equation represents the system 7x + 5y = 27 and 2x + 7y = 27?
1. $\begin{pmatrix} 7 & 5 \\ 2 & 7 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 27 \\ 27 \end{pmatrix}$
2. $\begin{pmatrix} 7 & 2 \\ 5 & 7 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 27 \\ 27 \end{pmatrix}$
3. $\begin{pmatrix} 7 & 5 \\ 2 & 7 \end{pmatrix}\begin{pmatrix} 27 \\ 27 \end{pmatrix}$ = $\begin{pmatrix} x \\ y \end{pmatrix}$
Which matrix equation represents the system 5x + 9y = 35 and 6x + 4y = 37?
1. $\begin{pmatrix} 5 & 9 \\ 6 & 4 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 35 \\ 37 \end{pmatrix}$
2. $\begin{pmatrix} 5 & 6 \\ 9 & 4 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 35 \\ 37 \end{pmatrix}$
3. $\begin{pmatrix} 5 & 9 \\ 6 & 4 \end{pmatrix}\begin{pmatrix} 35 \\ 37 \end{pmatrix}$ = $\begin{pmatrix} x \\ y \end{pmatrix}$
Which matrix equation represents the system 4x + 4y = 14 and 4x + 6y = 36?
1. $\begin{pmatrix} 4 & 4 \\ 4 & 6 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 14 \\ 36 \end{pmatrix}$
2. $\begin{pmatrix} 4 & 4 \\ 4 & 6 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 14 \\ 36 \end{pmatrix}$
3. $\begin{pmatrix} 4 & 4 \\ 4 & 6 \end{pmatrix}\begin{pmatrix} 14 \\ 36 \end{pmatrix}$ = $\begin{pmatrix} x \\ y \end{pmatrix}$
Which matrix equation represents the system 9x + 8y = 40 and 9x + 6y = 16?
1. $\begin{pmatrix} 9 & 8 \\ 9 & 6 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 40 \\ 16 \end{pmatrix}$
2. $\begin{pmatrix} 9 & 9 \\ 8 & 6 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 40 \\ 16 \end{pmatrix}$
3. $\begin{pmatrix} 9 & 8 \\ 9 & 6 \end{pmatrix}\begin{pmatrix} 40 \\ 16 \end{pmatrix}$ = $\begin{pmatrix} x \\ y \end{pmatrix}$
Which matrix equation represents the system 8x + 3y = 32 and 2x + 3y = 32?
1. $\begin{pmatrix} 8 & 3 \\ 2 & 3 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 32 \\ 32 \end{pmatrix}$
2. $\begin{pmatrix} 8 & 2 \\ 3 & 3 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 32 \\ 32 \end{pmatrix}$
3. $\begin{pmatrix} 8 & 3 \\ 2 & 3 \end{pmatrix}\begin{pmatrix} 32 \\ 32 \end{pmatrix}$ = $\begin{pmatrix} x \\ y \end{pmatrix}$
Which matrix equation represents the system 2x + 4y = 32 and 4x + 2y = 29?
1. $\begin{pmatrix} 2 & 4 \\ 4 & 2 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 32 \\ 29 \end{pmatrix}$
2. $\begin{pmatrix} 2 & 4 \\ 4 & 2 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 32 \\ 29 \end{pmatrix}$
3. $\begin{pmatrix} 2 & 4 \\ 4 & 2 \end{pmatrix}\begin{pmatrix} 32 \\ 29 \end{pmatrix}$ = $\begin{pmatrix} x \\ y \end{pmatrix}$
Which matrix equation represents the system 4x + 7y = 24 and 8x + 8y = 36?
1. $\begin{pmatrix} 4 & 7 \\ 8 & 8 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 24 \\ 36 \end{pmatrix}$
2. $\begin{pmatrix} 4 & 8 \\ 7 & 8 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 24 \\ 36 \end{pmatrix}$
3. $\begin{pmatrix} 4 & 7 \\ 8 & 8 \end{pmatrix}\begin{pmatrix} 24 \\ 36 \end{pmatrix}$ = $\begin{pmatrix} x \\ y \end{pmatrix}$
Which matrix equation represents the system 7x + 7y = 34 and 8x + 7y = 12?
1. $\begin{pmatrix} 7 & 7 \\ 8 & 7 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 34 \\ 12 \end{pmatrix}$
2. $\begin{pmatrix} 7 & 8 \\ 7 & 7 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 34 \\ 12 \end{pmatrix}$
3. $\begin{pmatrix} 7 & 7 \\ 8 & 7 \end{pmatrix}\begin{pmatrix} 34 \\ 12 \end{pmatrix}$ = $\begin{pmatrix} x \\ y \end{pmatrix}$
Which matrix equation represents the system 7x + 3y = 30 and 5x + 3y = 26?
1. $\begin{pmatrix} 7 & 3 \\ 5 & 3 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 30 \\ 26 \end{pmatrix}$
2. $\begin{pmatrix} 7 & 5 \\ 3 & 3 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 30 \\ 26 \end{pmatrix}$
3. $\begin{pmatrix} 7 & 3 \\ 5 & 3 \end{pmatrix}\begin{pmatrix} 30 \\ 26 \end{pmatrix}$ = $\begin{pmatrix} x \\ y \end{pmatrix}$
Which matrix equation represents the system 5x + 8y = 38 and 8x + 8y = 15?
1. $\begin{pmatrix} 5 & 8 \\ 8 & 8 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 38 \\ 15 \end{pmatrix}$
2. $\begin{pmatrix} 5 & 8 \\ 8 & 8 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 38 \\ 15 \end{pmatrix}$
3. $\begin{pmatrix} 5 & 8 \\ 8 & 8 \end{pmatrix}\begin{pmatrix} 38 \\ 15 \end{pmatrix}$ = $\begin{pmatrix} x \\ y \end{pmatrix}$
Which matrix equation represents the system 5x + 7y = 23 and 5x + 3y = 36?
1. $\begin{pmatrix} 5 & 7 \\ 5 & 3 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 23 \\ 36 \end{pmatrix}$
2. $\begin{pmatrix} 5 & 5 \\ 7 & 3 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 23 \\ 36 \end{pmatrix}$
3. $\begin{pmatrix} 5 & 7 \\ 5 & 3 \end{pmatrix}\begin{pmatrix} 23 \\ 36 \end{pmatrix}$ = $\begin{pmatrix} x \\ y \end{pmatrix}$
Which matrix equation represents the system 4x + 7y = 20 and 5x + 4y = 15?
1. $\begin{pmatrix} 4 & 7 \\ 5 & 4 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 20 \\ 15 \end{pmatrix}$
2. $\begin{pmatrix} 4 & 5 \\ 7 & 4 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 20 \\ 15 \end{pmatrix}$
3. $\begin{pmatrix} 4 & 7 \\ 5 & 4 \end{pmatrix}\begin{pmatrix} 20 \\ 15 \end{pmatrix}$ = $\begin{pmatrix} x \\ y \end{pmatrix}$
Solve the system 4x + 4y = 0 and 3x + 1y = 10 by multiplying by the inverse of the coefficient matrix. What is x?

Answers

$-7$
$18$
4 × 7
$38$
$28$
2 × 8
$32$
$\frac{8}{37}$
$15$
$-29$
A rotation of 90° counterclockwise about the origin
$4$
$\begin{pmatrix} 4 & 5 \\ 4 & 2 \end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix}$ = $\begin{pmatrix} 18 \\ 35 \end{pmatrix}$
$5$