Sue buys a certain brand of cereal that costs $12 per box. sue changes to a super-saving brand of the same size. the equation shows the price, y, as a function of the number of boxes, x, for the new brand.

y = 8x

part a: how many more dollars is the price of a box of sue's original brand of cereal than the price of a box of the super-saving brand? show your work.

part b: how much money does sue save each month with the change in cereal brand if she buys 4 cereal boxes each month? show your work.