Once learners realize what direct variation is, they see it's just a type of linear function. The lesson poses a general question that leads to the creation of the y = kx formula. The resource includes discussion prompts and ideas for extension and differentiation. 

Concepts

direct variation, proportions

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Additional Tags

math

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Instructional Ideas

• Use as a discussion before teaching the lesson on direct variation

Classroom Considerations

• Your class should be have prior knowledge on linear functions

Pros

• Inquiry-based learning to discuss the direct variation formula

Cons

• None

Common Core

8.EE.B.5 HSF-LE.A.1.b