Grade 8 Math lesson plan: Systems of linear equations

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Planning notes for this lesson

Prerequisite skills to check: solving one-variable linear equations (8.EE.C.7); graphing y = mx + b (8.F.A.3); finding the intersection of two lines by looking at a graph.

Key vocabulary: system of equations, simultaneous, solution, intersection, substitution, elimination, no solution, infinitely many solutions.

Warm-up idea: Show two phone plans on the board (monthly fee plus a per-gig charge) and ask when the plans cost the same. Let students guess, then say today's lesson is how to find that answer with equations and a graph.

Exit ticket idea: Students solve one system by graphing, one by substitution or elimination, and decide from a third pair of equations whether there is one solution, no solution or infinitely many, explaining what that means on a graph.

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Grade 8 Systems of linear equations quiz prompt →