# Lessons 8–9: Representing Proportional Relationships with Equations

Essential Question: Can you use the constant of proportionality in an equation to represent a real world example?

7.RP.2b

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S.29 Example 1: Do we have enough gas to make it to the gas station?

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Discussion

S.29 Example 1 Continued

S.30 Example 2: Andrea’s Portraits (Group Work)

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S.31-32

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Essential Question: Can you use the constant of proportionality in an equation to represent a real world example?

7.RP.2c

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S.33

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S.34 Al’s Produce Stand

Discussion

• Which makes more sense: to use a unit rate of “ears of corn per dollar” or of “dollars/cents per ear of corn”?
• Based on the previous question, which would be the independent variable?
• Which would be the dependent variable and why?
• How do you write an equation for a proportional relationship in a generic form?

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S.35-36

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