Answer :
1.solve for y
2x+4y=12
-2x -2x
4y=12-2x
4 4
y=3-1/2x
step2 plug in y and solve for x
2x+8y=24
2x+8(3-1/2x)= 24
2x+24-4x=24
-2x=0
-2 -2
x=0
last step plug in x and solve for y
y=3-1/2x(0)
y=3
2x+4y=12
-2x -2x
4y=12-2x
4 4
y=3-1/2x
step2 plug in y and solve for x
2x+8y=24
2x+8(3-1/2x)= 24
2x+24-4x=24
-2x=0
-2 -2
x=0
last step plug in x and solve for y
y=3-1/2x(0)
y=3