Question

Please solve the question number 8

Answer 1

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.