D because if you multiply y 8 times it will no longer be doubling the area
Nineteen million, two hundred sixty-six thousand, four hundred twenty! :)
3x-4y=10
-20-x+2y=10 then -30+2y=x now plug this in the other equation:
3(-30+2y)-4y=10
-90+6y-4y=10
2y=100
y=50
