Find Value of Given Equation

If 999x + 888y = 1332 and 888x 999y =555, then X2  – y2  equal is

  1. 8
  2. 9
  3. 5
  4. 7
Manish Listener Asked on 15th June 2015 in Maths.
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  • 1 Answer(s)

    Answer: (4) 7
    Explanation:-
    999X + 888Y = 1332
    111(9X + 8Y) = 1332
    9X + 8Y = 1332/111
    9X + 8Y = 12               …………………(1)
    And,
    888X + 999Y = 555
    111(8X + 9Y) = 111 x 5
    8X + 9Y = 5                ………………………(2)
    Solve equation (1) & (2)
    Y = -3  &   X = 4
    X2 – Y2 = 42 – 32
    = 16  – 9 = 7
    Hence, the answer is (4) 7

    Anurag Mishra Professor Answered on 15th June 2015.
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