x has no value, so all we can do is simplify.
Add 8x to both sides.
-8x+2y=20
+8x +8x
You now have 2y=8x+20
Divide both sides by 2 and remember to divide EVERY TERM by 2.
2y=8x+20
2 2
You now have y=4x+10
So, your answer is y=4x+10
Hope this helped!