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x=4-3y
x+y=-6
4-3y+y = -6
-2y = -10 /(-2)
y = 5
x = -11
b)
y=2x-8
-12x+9y=-6
-12x+9(2x-8) = -6
-12x+18x-72 = -6
6x = 66 /6
x = 11
y = 14
( x+y=-6
4-3y+y=-6|-4
-2y=-10|:(-2)
(y=5
( x= 4-3*-5=-11
b) ( y=2x-8
( -12x+9y=-6
-12x+9(2x-8)=-6
-12x+18x-72=-6|+72
6x=66|:6
(x=11
(y= 2x-8= 2*11-8=22-8=14