Please solve the question number 8
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You can write these equations like :
2ax - 2by = -a-4b ..... (1)
2bx + 2ay = 4a-b .........(2)
Now, multiplying (1) by a & (2) by b,
2a^2x - 2aby = -a^2 - 4ab ......(3)
2b^2x + 2aby = -b^2 + 4ab .....(4)
Adding (3) & (4),
2 (a^2+b^2) x = -(a^2+b^2).
Obviously, x = -1/2.
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