I'm on board with the other answers using the X example, but with a little twist:
Accept starts with A, so you're Adding. In order to (a)ccept something, you have to (a)dd to whatever's there already.
Except starts with Ex, so you're X-ing it out, EXcluding it, or taking it away.
The easiest way to do this is to change the equation so that it is in slope-intercept form: y = mx + b
where m = the slope (meaning the direction / angle of the line)
and b = the y-intercept (the place where the line hits or intercepts the y axis)
Andrea, I understand why you're getting that answer and it's a simple mistake. Using PEMDAS is absolutely the right thing to do, but what you might not have realized is where you're getting confused.
So, let's review. PEMDAS:
P(arenthesis), E(xponents), M(ultiplication), D(ivision),...