SOLUTION: A triangle has vertices K(-2,2), L(1,5) and M (3,-3). Verify that the triangle has a right angle

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Question 281533: A triangle has vertices K(-2,2), L(1,5) and M (3,-3). Verify that the triangle has a right angle
Answer by richwmiller(17219) About Me  (Show Source):
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you need to find the slope of each line.
(y-y)/(x-x)= m the slope
m*-1/m=-1
if the product of the slopes equal -1 then they are perpendicular and form a right angle.