1. The total number of integers pairs (x, y) satisfying the equation x + y = xy is
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By: anil on 05 May 2019 02.30 am
xy = x + y => xy - x - y = 0 => xy - x - y + 1 = 1 => (x - 1) (y - 1) = 1 => Both x - 1 and y - 1 have to be equal to 1 or -1. So, values taken by (x,y) are (2,2) and (0,0). => 2 solutions
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