The system of equations is
.
First take 
(Substitute
)
(Subtract
from each side)
(Simplify)
(Rewrite
)
(Distributive property)
(Common factor)
(Zero product property)
(Solve for x)
Now solve for y.
\
(Substitute
)
(Add:
)
(Substitute
)
(Add:
)
The solutions of them system are
.