Answer:
If you want to solve for x, then it is x=3+y
If you want to solve for y, then it is y=x-3
Explanation:
You want to isolate the variable you are solving for. If you are solving for x, you don't have to isolate it because it is already on its own side. You only have to divide by 3 to take away the 3 from the x but make sure do whatever you do on one side to the other side to make sure its still equal. After you divide 3 on both sides, you end with x=3+y.