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Representing Proportional Relationships: IM 8.3.3
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1. Lesson 8.3.3
- IM 8.3.3 Lesson: Representing Proportional Relationships
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2. Practice 8.3.3
- IM 8.3.3 Practice: Representing Proportional Relationships
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Representing Proportional Relationships: IM 8.3.3
IM 6 – 8 Math, GeoGebra Classroom Activities, Aug 18, 2020

“Representing Proportional Relationships” from IM Grade 8 by Open Up Resources and Illustrative Mathematics. Licensed under the Creative Commons Attribution 4.0 license.
Table of Contents
- Lesson 8.3.3
- IM 8.3.3 Lesson: Representing Proportional Relationships
- Practice 8.3.3
- IM 8.3.3 Practice: Representing Proportional Relationships
IM 8.3.3 Lesson: Representing Proportional Relationships
Find the value of each product mentally.
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Here are two ways to represent a situation.
Description: | Equation: |
Jada and Noah counted the number of steps they took to walk a set distance. To walk the same distance, Jada took 8 steps while Noah took 10 steps. Then they found that when Noah took 15 steps, Jada took 12 steps. | Let represent the number of steps Jada takes and let represent the number of steps Noah takes . |
Create a table that represents this situation with at least 3 pairs of values.


Graph this relationship and label the axes.

How can you see or calculate the constant of proportionality in each representation? What does it mean?
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Explain how you can tell that the equation, description, graph, and table all represent the same situation.
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Here are two ways to represent a situation.
Description: | Table: |
The Origami Club is doing a car wash fundraiser to raise money for a trip. They charge the same price for every car. After 11 cars, they raised a total of $93.50. After 23 cars, they raised a total of $195.50. | |
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Graph this relationship and label the axes.

How can you see or calculate the constant of proportionality in each representation? What does it mean?
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Explain how you can tell that the equation, description, graph, and table all represent the same situation.
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Your teacher will give you either a problem card or a data card. Do not show or read your card to your partner.
If your teacher gives you the problem card: | If your teacher gives you the data card: |
|
|
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Ten people can dig five holes in three hours. If n people digging at the same rate dig m holes in d hours:
Is proportional to when ?
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Is proportional to when ?
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Is proportional to when ?
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IM 8.3.3 Practice: Representing Proportional Relationships
Here is a graph of the proportional relationship between calories and grams of fish:

Write an equation that reflects this relationship using to represent the amount of fish in grams and to represent the number of calories.
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Use your equation to complete the table:


Students are selling raffle tickets for a school fundraiser. They collect $24 for every 10 raffle tickets they sell.
Suppose is the amount of money the students collect for selling raffle tickets. Write an equation that reflects the relationship between and .
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Label and scale the axes and graph this situation with M on the vertical axis and R on the horizontal axis. Make sure the scale is large enough to see how much they would raise if they sell 1000 tickets.

Describe how you can tell whether a line’s slope is greater than 1, equal to 1, or less than 1.
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A line is represented by the equation . What are the coordinates of some points that lie on the line?
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Graph the line.

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