In order to find the solution graphically, you can solve both equations for y:
x + 2y = 2
y = -1/2 x + 1
2x + 4y = 4
y = -1/2 x + 1
The graph of the previous equations are:
As you can notice, the equations correspond to the same line. It means that the two lines have the same points and then, there are infinite solutions to the system.
