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Two perpendicular lines PQ and QR intersect at (1, -1). If the equation of PQ is x - 2y + 4 = 0, find the equation of QR.

 Sep 5, 2020
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1, -1     is NOT on the eqation   x - 2y+4 = 0     so the lines cannot intersect there ! cheeky

 Sep 5, 2020

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