Please help with this Maths question.   Question  In a triangle diagram, OA = a, and OB = b.   The point P divides OA in the ratio OP:PA = 4:1   The point Q divided AB in the ratio AQ:QB = 2:3   The point R placed at the end of the extended line OB is such that OB:BR = 5:3   (a) Show that PQ=2/5b - 1/5a   (b) Show that P, Q and R lie on a straight line.

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by mwansae at June 11, 2012