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Common Core Math · Grade 8

8.EE.C.8 Analyze and solve systems of linear equations

Analyze and solve pairs of simultaneous linear equations, understanding that solutions correspond to points of intersection, and solving systems by graphing and algebraically in the context of real-world problems.

Why water teaches this standard well

This is the flagship grade 8 water-math standard: students compare a flat-fee water plan to a per-gallon plan by writing each as an equation and solving the system to find the exact usage level where both plans cost the same. Comparing two real utility rate structures is the clearest possible motivation for solving a system of equations.

Materials tagged with this code are written to the full standard , and each carries a written note explaining the alignment. See how we review materials.

22 materials aligned to 8.EE.C.8

Lesson plans

Worksheets

Math problem sets

Grade 8 Math problem set

Kirtlebridge Service Lines: Two Systems of Equations

A grade 8 problem set where students write and solve two systems for a fictional district's lead service line work, one for cost and one for two crews' progress.

Math 50 min Answer key

Grade 8 Math problem set

Kessington Row Lead Lines: Comparing Two Crew Rates

A grade 8 set on a lead service line replacement program where students write two linear equations, solve for the week the crews match, and interpret a no-solution case.

Engineering & Design 45 min Answer key

Grade 8 Math problem set

Saltmarsh Cove Water Blending: A System of Equations

Grade 8 students write and solve a system of two equations to blend reverse-osmosis water with brackish well water to a target at a fictional coastal plant.

Science 45 min Answer key

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Quizzes & test questions