Solving for y means trying to get the equation into the form y= _____. So, let's say that we are going to keep the y value on the left side of the equation.
First, we would subtract ax from both sides. This results in the equation by=c-ax.
Next, we figure out that y has a coefficient of b. They are combined together by multiplication, so to undo this operation, we need to divide both sides by b.
If done correctly, your final answer should be

. Or, y=c-ax/b