solve for X and Y
bx+ay=2ab ; ax-by=a^2-b^2
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b* x + a* y + a* x + b* y = a^2 + 2* (ab) + b^2
REarrange above equation as,
a* x + a* y + b* x + b* y = a^2 + 2* (ab) + b^2
a* (x+y) + b* (x +y) = a^2 + 2* (ab) + b^2
(a+b)* (x+y) = a^2 + 2* (ab) + b^2
(a+b) * (x+y) = (a+b)^2
x + y = (a+b)
==> x = a+ b - y
==> y = a + b - x
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