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system of linear equations

two or more linear equations together

solution of a system of linear equations

an ordered pair in a system that makes all the equations of a system true

no solution

when the graphs of the equations of a system are parallel

infinitely many solutions

when the graphs of the equations of a system are the same

substitution method

replacing one variable with an equivalent expression containing the other variable

elimination method

add or subtract equations to eliminate a variable

linear inequality

describes a region of the coordinate plane that has a boundary line

solutions of an inequality

the coordinates of the points that make an inequality true

system of linear inequalities

two or more linear inequalities together

solution of a system of linear inequalities

a solution that makes each inequality in the system true