Question 44062
{{{y-x=5/2x+y}}}
cancel the y's
{{{-x=5/2x}}}
{{{0=7/2x}}}

So x must be zero.
{{{5/2x+y=8}}}
we now know that x=0, so y=8.

I hope this helps 
P.S. I am trying to start up my own homework help website. I would be extremely grateful if you would e-mail me some feedback on the help you received to adam.chapman@student.manchester.ac.uk