2y+y=3
First, you want to combine like terms. The only variable in this problem is y, so let's combine our y's.
2y+y=3y.
So here's our equation after combining like-terms.
3y=3
We need to separate our y so that it's by itself, so the only way to do that is divide by 3 on EACH side. So:
3y/3=y, and 3/3=1
The answer to our equation is y=1