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3x+3y+9=0
y=2x+6
3y=-3x-9 /:3
y=2x+6
y=-x-3 /*2
y=2x+6
2y = -2x-6
3y = 0
y = 0
0 = -x-3
-x=3
x=-3
x=-3
y=0
3x+3y+9=0
3x+6x+18+9=0
9x=-27
x=-3
y=-3×2+6
y=0