WRITING LINEAR EQUATIONS FINDING THE SLOPE OF A LINE Warm-up: 15 minutes y=12 y=-5y= ) -5 + (- 9) 12.) -1 - (-9)13.) 8 + (-23) 14.) ) 8 - (-2)16.) (-9) Rate of Change Example (4, 3) (-1, 1) RISE: 2 units run: 5 units Find the slope of the line passing through: (- 1,1)(4,3) Slope = rise run Slope = 2 5 Your Turn (3, 4) (-1, -2) RISE: 6 units run: 4 units Find the slope of the line passing through: (-1,- 2)(3,4) Slope = rise run Slope = 6 4 Example Find the slope of the line passing through: A(-2,1) B(6,7) A(-2, 1) B(6, 7) x1x1 x2x2 y2y2 y1y1 Slope = y 2 - y 1 x 2 - x 1 Slope = (-2) Slope = Your Turn! Find the slope of the line passing through: A(2,- 5)B(7,12) A(2, -5) B(7, 12) x1x1 x2x2 y2y2 y1y1 Slope = y 2 - y 1 x 2 - x 1 Slope = 12 - (-5) Slope = 17 5 Practice: find the slope of the following: 1. (0, 7)(0,5) 2. (10, 3)(2,5) 3. (12, 9)(6,7) 4. (10, 1)(4,9) 5. (-8, 5)(6,-3) Slope = undefined Slope = -2/8 or -1/4 Slope = 2/6 or 1/3 Slope = -8/6 Slope = -8/14 or -4/7