Cover it up to reveal the values of variables. Using arrangements of colored tiles representing algebraic expressions, pupils layer them over each other to determine the values of variables. The procedure models the elimination method in solving linear systems.

Concepts

systems of equations, systems of linear equations, variables

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Additional Tags

math

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Instructional Ideas

• Have class members write the equations that result from layering the tiles

Classroom Considerations

• The class should be familiar with solving systems of linear equations with two variables
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Pros

• Provides hints on how to get started
• Shows the correct answer if students give the wrong one

Cons

• The different colors of the layers are not always visible

Common Core

8.EE.C.8.a HSA-REI.C.6