You have to rearrange this so the equation will equal y :
Now take away x from both sides. This will leave you with : As you can see the equation is equal to y, however, there is a 2 next to the y so we need to get rid of that. So 2y basically means : 2* y And the opposite of * is divide, which means we have to divide both sides by 2, which will leave us with our answer :