Progress from proportional relationships to linear functions. Pupils first review concepts of proportionality covered in earlier grades. They then extend these concepts to linear functions, such as determining the slope of a line using similar triangles.

Concepts

proportional reasoning, linear relationships, linear equations, slope, slope formula

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Additional Tags

math

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Instructional Ideas

• Supplement a unit on writing linear functions
• Team up with a technology teacher to actually build the steps that pupils design during a class activity

Classroom Considerations

• Learners should have previous knowledge of ratios, rates, and constants of proportionality
• The second chapter of a 10-part eighth grade workbook series

Pros

• Resource includes a self-assessment check for learners to complete
• Teacher resource indicates where to look for mathematical practices

Cons

• Mainly teacher-centered lessons

Common Core

8.EE.B.5 8.EE.B.6 8.F.B.4