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-12+2x+2y=3x-3
6x+6y=4x-4y-4
-x+2y=9
2x+10y=-4 /:2
-x+2y=9
x+5y=-2
----------- +
7y=7
y=1
x+5=-2
x=-7
d)
12-6x+y-3y=0
2y-x-y=2x-6
-6x-2y=-12 /:(-2)
-3x+y=-6
3x+y=6
-3x+y=-6
---------- +
2y=0
y=0
3x=6
x=2