Question

2x + y = 1,

x + 2y = 1

Answer 1

x + 2y = 1
x = 1 - 2y
Plug it in instead of x in the first equation and solve for x.

Answer 2

so y=1?

Answer 3

Do you need to find x and y? If so, here are the steps...
x+2y=1
x=-2y+1
(Plug that into x+2y=1)
-2y+1+2y=1
Then figure it out from there.