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

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Question 577917: find slope of a line perpendicular to the line that passes through points
(3,9) and (7, 15)
Answer by dfrazzetto(283) About Me  (Show Source):
You can put this solution on YOUR website!
First find the slope of the original line
slope = m1 = y2-y1/(x2-x1) = 15-9/(7-3) = 6/4 = 3/2
A line of perpendicular slope will have slope m2 such that it is the negative reciprocal of the original slope m1
m2 = inverse reciprocal of 3/3 = -2/3