Answer:
4.5
Explanation:
In order to solve this you want to isolate the variable, by doing the inverse operation.

Why is it division? 8y means 8*y so the inverse or opposite of multiplication is division.
Now you have

because the 8's cancel out.
36/8 = 4.5
You dont always have to simplify it, but you can if you choose to or if your teacher wants you to.