Answer :

1)combine like terms
2) move 9 to the other side by subtracting 9
3) divide by the # that is in front of y - to both sides
answer you should get: -11/2
6y+9-4y=-3
6y-4y=2y
2y+9=-3
-9 -9
2y=-12
2/2 -12/2
Y=-6 should be the answer if I did it correctly