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Math Curriculum

Level DUnit: Ratios and ProportionsKey Lesson 7.2.4 Proportional Relationships and Equations

Lesson topic: Proportional relationships and equations

Instructor Materials

• Teacher guide
• Slides
• Practice Problems resource
• CCRS standard: 7.RP.2c
• Learning goal: Generalize a process for finding missing values in a proportional relationship, and justify (orally) why this can be abstracted as y = kx, where k is the constant of proportionality. Generate an equation of the form y = kx to represent a proportional relationship in a familiar context. Write the constant of proportionality to complete a row in the table of a proportional relationship where the value for the first quantity is 1.
• 7.2 Assessment and Practice Problems

Related Lessons

Review and Extend

Use these supplemental lessons if needed after teaching this key lesson.

Used with permission:

1. IM K-5 Math was originally developed by Open Up Resources (OUR) and authored by Illustrative Mathematics® (IM), and is copyrighted 2017-2019 by Open Up Resources. It is licensed under the Creative Commons Attribution 4.0 International License (CC BY 4.0). OUR's K-5 Math Curriculum is available at https://openupresources.org/math-curriculum/.

2. Adaptations and updates to IM K-5 Math are copyrighted 2019 by Illustrative Mathematics®, and are licensed under the Creative Commons Attribution 4.0 International License (CC BY 4.0).

3. The Illustrative Mathematics® name and logo are not subject to the Creative Commons license and may not be used without the prior and express written consent of Illustrative Mathematics®.

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