SOLUTION: find the slope of a line perpendicular to the the line that passes through the following points. (3,9) and (7,15)

Question 577894: find the slope of a line perpendicular to the the line that passes through the following points.
(3,9) and (7,15)
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
First find the slope of the line through the two points.

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

m = (15-9)/(7-3)

m = 6/4

m = 3/2

So the slope of the line that passes through the two points is 3/2

The perpendicular slope is simply the negative reciprocal of that slope. Basically, flip the fraction and the sign to get the perpendicular slope.

So the perpendicular slope is -2/3
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