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FLORIDA Pre-Algebra Teacher’s Guide Vol. A

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LESSON GOALS • use the graph of a line to write its equation in point-slope form. FLORIDA STANDARDS • MAFS.8.F.2.4 Construct a function to model a linear relationship between two quantities. Determine the rate of change and initial value of the function from a description of a relationship or from two (x, y) values, including reading these from a table or from a graph. Interpret the rate of change and initial value of a linear function in terms of the situation it models, and in terms of its graph or a table of values. PACING One class period, approximately 60 minutes CONTENT BACKGROUND Lessons 4.03 and 4.04 work together to teach students how to write the equation of a line whose graph is shown in three different forms. In Lesson 4.03, students use a graph to write the point-slope form of the equation of a line. In Lesson 4.04, students write the point-slope form of a line and then use the distributive property and properties of equality to convert it to the standard form of a line. They also learn two methods for writing an equation in slope-intercept form. As students work with functions, it is important that they be able to convert between different representations of functions—word descriptions, tables, equations, and graphs—and between different forms of equations. MATERIALS • reference Guide pages 158–159 • practice activity Book pages 114–120 • Overview and Toolkit presentations KEYWORDS Students can preview definitions of keywords hyperlinked throughout the lesson. • linear equation • point-slope form (of a linear equation) • slope • y-intercept Use this guide to accompany Lesson 4.03, Semester A. Equations from Graphs 202 EquaTIOnS FrOm Gr apHS

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