Question

Luke buys a certain brand of cereal that costs $11 per box. Luke 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 = 9x

Part A: How many more dollars is the price of a box of Luke’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 Luke save each month with the change in cereal brand if he buys 6 cereal boxes each month? Show your work.

Answer 1

Y = 9x means each box of the new brand is $9. 

So the old brand is $2 per box more. I know you 

can do part B now!
 Hope that helps!!!!!!!!!

Answer 2

The 9 represents the price so he is saving 2 dollars on the new brand he gets per box.

if he buys 6 boxes of the $9 box he will spend $54

if he buys 6 boxes of the $11 box he will spend $66

So with six boxes he saves 12 dollars