The points P (x1, y1), Q(x2,y2) and R (x,y) are collinear. Use the gradient formula to show that (x-x1) (y-y2) =(y-y1)(x-x2).

Holt Mcdougal Larson Pre-algebra: Student Edition 2012
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ISBN:9780547587776
Author:HOLT MCDOUGAL
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Problem 1.37EP
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The points P (x1, y1), Q(x2,y2) and R (x,y) are collinear. Use the gradient formula to show that (x-x1) (y-y2) =(y-y1)(x-x2).

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