Question

solve x+2y=-4
-3x+2y=4

Answer 1

x+2y=-4
-3x+2y=4

x=-2
y=-1

Answer 2

(x+2y)*(-3)=-4*(-3)

Answer 3

-3x-6y=12

Answer 4

-3x-6y=12
-3x+2y=4
- - -
0+-8y=8
y=-1

now put y=-1
-3x-6*(-1)=12
x=-2

Answer 5

lets verify
put x=-2, Y=-1
-3(-2)-6(-1)=12

12=12
LHs=RHS