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Three points P (h, k), Q(x(1) , y(1))" a...

Three points `P (h, k), Q(x_(1) , y_(1))" and " R (x_(2) , Y_(2))` lie on a line. Show that ` (h - x_(1)) (y_(2) - y_(1)) = (k - y_(1)) (x_(2) - x_(1))`.

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`(h - x_(1)) (y_(2) - y_(1)) = (k - y_(1)) (x_(2) - x_(1))`
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