FLORIDA Pre-Algebra Teacher’s Guide Vol. A

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LESSON GOALS • Understand slope in a real-world situation. • Find the slope of a line using a graph. FLORIDA STANDARDS • MAFS.8.EE.2.5 Graph proportional relationships, interpreting the unit rate as the slope of the graph. Compare two different proportional relationships represented in different ways. • MAFS.8.EE.2.6 Use similar triangles to explain why the slope m is the same between any two distinct points on a non-vertical line in the coordinate plane; derive the equation y = mx for a line through the origin and the equation y = mx + b for a line intercepting the vertical axis at b. PACING One class period, approximately 60 minutes CONTENT BACKGROUND In previous lessons, students learned about rates, unit rates, slope, finding slope, and recognizing proportional relationships. In this lesson, they apply their knowledge to interpreting slopes as rates in real-world situations. Students will find slopes by counting rise and run on graphs and by using ordered pairs in the slope formula. To interpret slopes as rates, students will learn to evaluate each situation. For example, a negative slope in a graph about an elevator is interpreted as the elevator's rate of descent. MATERIALS • Reference Guide pages 126–129 • Practice Activity Book pages 98–103 • overview and Toolkit presentations KEYWORDS Students can preview definitions of keywords hyperlinked throughout the lesson. • rate • rise • run • slope • unit rate Use this guide to accompany Lesson 3.10, Semester A. Use Slope as a Rate USe SloPe AS A R ATe 175

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