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Three points P(h, k), Q(dotx1, y1) and R...

Three points `P(h, k), Q(dotx_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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V PUBLICATION-STRAIGHT LINES-QUESTIONBANK
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