3x+y=2
x+2y=-6
y=2-3x
x+2(2-3x)=-6
x+4-6x=-6
x-6x=-6-4
-5x=-10
x=-10÷-5
x=2
y=2-3×2
y=-4
(x;y)=(2;-4)
3x+y=2
x+2y=-6
y=2-3x
x+2y=-6
x+2(2-3x)=-6
x+4-6x=-6
x-6x=-6-4
-5x=-10
x=-10÷-5
x=2
y=2-3×2
y=-4
(x;y)=(2;-4)