Unit 3 - Lesson 11 - Grade 8: Illustrative Mathematics

Which one doesn’t belong?

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What do you notice about them?

Which equation makes the most sense to represent all of the points with y-coordinate -4?

Explain how you know.

What do you notice about them?

Which equation makes the most sense to represent all of the points with x-coordinate 3?

• x = 3
• y = 3x
• y = 3
• x + y = 3

Explain how you know.

Each rectangle has a vertex that lies in the first quadrant. These vertices lie on a line. Draw in this line and write an equation for it.

What is the the slope of this line? How does the slope describe how the width changes as the length changes (or vice versa)?

Write equations for lines a, b, c, d, and e.