Chapter 5.1
Lesson Objective: NCSCOS 4.01 – Students will know how to find the slope of a line Students will know how to find the slope using two points
We refer to the slope of a line as the lower case letter: m The equation to find slope is: In order to find slope, we’re going to need two ordered pairs (points)
Example 1: Find the slope of the line that passes through (3, 5) and (6, 2) To solve this problem, we have to label our two points. It doesn’t matter which point you label x 1 and which one x 2
Plug the points into the slope equation
Simplify the top and the bottom Simplify the fraction
m = -1, so the slope for these two points is -1
1. (1, 3), (2, 7) 2. (6, 3), (7, -4) 3. (6, -2), (5, -4) 4. (7, -4), (4, 8) 5. (15, 2), (-6, 5) Find the slope for the following points
Example: Find the slope of the line A. In order to find slope, you need two points Find two points on the line Plug the points into the slope equation (0, -1) (2, 2) A
Label the points and write the equation (0, -1) (2, 2) (0, -1) x 1, y 1 x 2, y 2
1. Find the slope of Line A 2. Line B 3. Line C 4. Line D D C B A
1. Find the slope: (2, 5), (-4, 2) 2. (-5, 3), (2, 0) 3. (-3, -7), (2, -4) 4. Line A 5. Line B B A