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y= x-3 |*(-1)
y=1,2x+3
-y=-x+3
y=1,2x+3
0,2x=6 |/0,2
x=30
y=30-3
x=30
y=27
C)
y=-2x+6
3x-2y=6
y+2x=6 |*2
-2y+3x=6
2y+4x=12
-2y+2x=6
6x=18 |/6
x=3
y=-2*6+6
x=6
y=-6