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Twice the middle term is sum of terms on either side. 2 a = 18 + b 2 b = a - 3 adding these two equations, a + b = 15 ================== x + 1/x = 50/7 7 x^2 - 50 x + 7 = 0 (7x - 1)(x - 7) = 0 Number is x = 7 or 1/7 ========================== Y = 3 and Y = - 3 x will intersect at Y = 3 = - 3 x => x = -1 ie., (-1, 3) ============================= (x+y)/(xy) = 1/y + 1/x