What does it mean for an equation to express y in terms of x?

It means that you have to put equation like this:
y = some expression with x in it 
in other words you have to re-write given expression so the "y" is on one side of the equation while "the rest" and "x's" are on the other side. 

Hi i’m back at my moms now i’ll call her when she can get there i’m gonna go first