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{-2x+y=0 |*2
{x-2y=3
+{-4x+2y=0
__________
-3x=3|:(-3)
x=-1
-1-2y=3
-2y=4|:(-2)
y=-2
{-2x+y=0
{2x-4y=6
{-2x+y=0
-3y= 6 |/-3
y= -2
y=-2
2x+8=6
y=-2
2x= -2 |/2
y=-2
x=-1
-2x+y=0
x=3+2y
-2(3+2y)+y=0
x=3+2y
-6-4y+y=0
x=3+2y
-6-3y=0
x=3+2y
-3y=6I:(-3)
x=3+2y
y=-2
x=3+2*(-2)
y=-2
x=3-4
y=-2
x=-1