2x+y=0
3y+2y=1
5x+2y=1
I
2x+y=0 / *(-2)3x+2y=1
-4x-2y=03x+2y=1________ +-x=1 / :(-1)x=-1x=-12x+y=0
x=-12*(-1)+y=0
x=-1y=2
II
2x+y=0 / *(-2)5x+2y=1
-4x-2y=05x+2y=1
________ +x=1
x=12x+y=0
x=12*1+y=0
x=1y=-2
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I
2x+y=0 / *(-2)
3x+2y=1
-4x-2y=0
3x+2y=1
________ +
-x=1 / :(-1)
x=-1
x=-1
2x+y=0
x=-1
2*(-1)+y=0
x=-1
y=2
II
2x+y=0 / *(-2)
5x+2y=1
-4x-2y=0
5x+2y=1
________ +
x=1
x=1
2x+y=0
x=1
2*1+y=0
x=1
y=-2