Answer
8x-4y=12; subtract 8x from both sides
-8x+8x-4y=12-8x; the 8x on the left side "zeroes out"
-4y=-8x+12; move the inverse of -4 to both sides leaving y alone on the left.
(-1/4)-4y=(-8x/-4)+(12/-4)--> same as (-1/4)(-4Y)= (-8X+12)/-4: simplify
y=2x-3
Explanation: