Starting system: 

In this example, we use the simpler "substitution" method. Solve the top equation for "x", to get:
x = 2  y
Substitute "2y" for "x" in the 2nd equation, to get:
(2y)  3y = 0
2  4y = 0
4y = 2
y = 0.5
Thus, x = 2  y = 2  0.5
x = 1.5