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FLORIDA Pre-Algebra Teacher’s Guide Vol. A

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Use this guide to accompany Lesson 3.03, Semester A. Lines and Intercepts LESSON GOALS • Write an equation of a line in standard form. • Use an equation in standard form to find the intercepts of a line. • Graph a line using its intercepts. FLORIDA STANDARDS • 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 KEYWORDS Students can preview definitions of keywords hyperlinked throughout the lesson. • linear equation • properties of equality • standard form of a linear equation • substitution property of equality • x-intercept • y-intercept MATERIALS • reference Guide pages 96–97 • practice Activity Book pages 64–67 • Overview and Toolkit presentations LEARN MATHCAST: LINES AND INTERCEPTS This MathCast introduces students to the standard form of an equation and shown how to write an equation in standard form. An equation's different forms is related to the different ways in which a laptop can be used. LINeS ANd INTerCepTS 133

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