Exercise 31 Page 170

Let's calculate the slope first. If we are given two points on a line, we can use this formula to find the slope: Slope=y_2-y_1/x_2-x_1 The two points on the line are given as (0,-2) and (0,5). Let's substitute these into the Slope Formula.

Slope=y_2-y_1/x_2-x_1

SubstitutePoints

Substitute ( 0,-2) & ( 0,5)

Slope=- 2- 5/0- 0

SubTerms

Subtract terms

Slope=- 7/0

Because dividing by 0 is not allowed (it's a big "no no"), the slope is undefined. The line through the given points is vertical. Its equation is x=0, which is not in slope-intercept form.