Linear equations, inequalities and systems

solving equations, literal equations, systems of equations, substitution, elimination, inequalities Solve linear equations in one variable, Solve a formula for a variable, Linear equations in two variables and their graphs, Solve systems of linear equations by substitution, Solve systems of linear equations by elimination, Systems with one, no or infinitely many solutions, Solve linear inequalities in one variable, Absolute value equations and inequalities, Linear inequalities and systems of inequalities in two variables