3.2.2 Slope-Intercept Form Key Objectives • Graph lines using the slope and y -intercept.

• Write and graph linear equations in slope-intercept form. • Identify slopes and y -intercepts and describe their meanings. Key Terms • A linear equation is in slope-intercept form when it is written in the form y = mx + b , where m represents slope and b represents the y -intercept. Example 1 Graphing by Using Slope and y-Intercept Use the following steps to graph a line given the slope and y -intercept. 1. Plot the y -intercept. 2. Starting from the y -intercept, use the slope (rise/run) to plot a second point. 3. Draw a line through the two points.

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