Try this sam. This problem will take two steps. First use this little trick to find x. x=x and y=x. Note: use this just to find x in first step!
2x + x = 6
substitute it in just for you x now.
2(2) + y = 6; and now find y
4 + y = 6; minus 4 from both sides
+y = 6-4
y=2 ;and substitute in.
4 + 2=6
and you answer is true! again: x =2, y=2
Hope this works out!