A pair of linear equations which has a unique solution x = 2 and y = - 3 is
(a) x + y = 1 and 2x - 3y = -5
(b) 2x + 5y =-11 and 4x + 10y = -22 (c) 2x - y = 1 and 3x + 2y = 0
(d) x - 4y - 14 = 0 and 5x 13 = 0
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