Question

If ax + by = a² – b ² and bx + ay = 0, , then x + y is
(a) a-b
(b) a+b
(c) b - a
(d) a²-b²



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Answer 1

(a) a-b

Given,

ax+by = a²−b² (1)

bx+ay=0 (2)

Now adding (1) and (2) we get,

x(a+b)x+(a+b)y=a²−b ²

x+y = a-b