Posted by Alone3030 on Wednesday, February 1, 2012 at 12:37pm.
The slope of PQ is (2+1)/(-4-2) = 3/-6 = -1/2
The slope of any line perpendicular to PQ will thus be 3.
Now you have a point and a slope. The line perpendicular to PQ and passing through M is
(y-3)/(x-5) = 3
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