x represents the number of movies ordered by Elvira.
69.99 is the constant Elvira has to pay for her cable service.
As we can see on the answer (C) the 4.99 is multiplied by x which represents the number of movies ordered by Elvira and she is charged 4.99 for each one so the logical thing to do is that we multiply 4.99 by x (number of movies ordered) then we add 69.99 to the product of 4.99x and we get the total amount Elvira has to pay this month
So the formula to find how much Elvira has to pay this month would be (C) y = 69.99 + 4.99x.
