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WAEC - Further Mathematics (2010 - No. 24)

P, Q, R, S are points in a plane such that PQ = 8i - 5j, QR = 5i + 7j, RS = 7i + 3j  and PS = xi + yj. Find (x, y).
(-6, -15)
(-6, 5)
(20, 5)
(20, 15)

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