Here is a well-designed resource that provides five yes-or-no questions which model different situations with linear functions. It makes a good pre-test for the beginning of the unit. The purpose is to elicit common misconceptions of word phases that describe different linear functions. The commentary not only gives an explanation of the solution, but explains how the student may mistake the situation. 

Concepts

functions, linear relationships, linear

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Additional Tags

function, linear relationship, y=mx + b, math

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Pros

• Well-designed resource
• Can be used as a pre-test
• Explains students' misconceptions

Cons

• None

Common Core

8.F.A.1 8.F.A.2 8.F.A.3 8.F.B.4 8.F.B.5