1. Example 2 Positive and Negative Slope Find the slope of the line. a. = run rise m = x1x1 x2x2 y1y1 y2y2 – – 15 27 – – = 4 5 =

2. Example 2 Positive and Negative Slope Find the slope of the line. 24 63 – – = 2 – 3 = or 2 3 – b. = x1x1 x2x2 y1y1 y2y2 – – = run rise m

3. Example 3 Zero and Undefined Slope Find the slope of the line. 26 33 – – = 4 0 = = 0 a. = x1x1 x2x2 y1y1 y2y2 – – = run rise m

4. Example 3 Zero and Undefined Slope Find the slope of the line. 0 6 = 11 4 – – = () 2 – The slope is undefined. b. = x1x1 x2x2 y1y1 y2y2 – – = run rise m

5. for Examples 2 and 3 Guided Practice Find the slope of the line passing through the points. ANSWER 0 4. (–3, –4), (5, 2) 5. (1, 5), (–3, 5) 2. (2, 1), (6, 4) 3. (0, 6), (10, 0) ANSWER 4 3 5 3 – 4 3

6. for Examples 2 and 3 Guided Practice Find the slope of the line passing through the points. ANSWER undefined ANSWER 0 6. (1, 6), (1, 2) 7. (–8, 3), (8, 3)