I thought you had to use substitution?
Here are the stages required:
1) Divide my bottom equation by 8
2) Substitute for y, leaving you with a single equation in terms of x
3) Collect like terms
4) Solve for x
5) Resubstitute to solve for y.
Post an attempt if you're still unable to get anywhere.
(he changed his handle to "Neo..." for reasons that I'll let him explain)