If is solution of and is solution of

then find the value of

I got the answer as 12.But i think that language of this question is not proper .It should have been

If and are solutions of and

then find the value of .

What do you guys think?

According to the answer i obtained i treated the 2 equations to be simultaneous equations in x and y and obtained 2 solutions.But according to language of the original question if is solution of first equation then it need not be solution of the second equation.