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The total number of integer pairs (x,y) satisfying the equation x+y=xy is

  1. 0
  2. 1
  3. 2
  4. None of these
asked in Quantitative Aptitude by (7.7k points)   | 22 views

1 Answer

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x+y=xy

or, x+y-xy=0

Subtracting 1 on both sides, x+y-xy-1 = -1

or, x(1-y)-1(1-y) = -1

or, (x-1)(1-y) = -1

So, total integer pairs are (2,2) and (0,0)
answered by (114 points)  

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