Find the slope of the line through P and Q. P(6, −3), Q(3, −3)

Question

1.10 Lines (5)

Answer 1

y=-3

it's a flat horizontal line with no slope

slope = 0

You can see that immediately by noticing the y coordinates are the same

or you can calculate slope as the difference in y coordinates divided by the difference in x coordinates

slope = (-3 - -3)/(6-3)= 0/3 =0

Answer 2

Slope is the ratio of rise over run. If you are given two points (x1,y1) and (x2,y2), then

slope = (y2 - y1) / (x2 - x1)

So in this case we have (6,-3) and (3,-3)

Slope = ( -3 - 6) / (3 - 6) = (-9) / (-3) = 3