Answer:
See below.
Step-by-step explanation:
Part A
"y = 11x is the function for the original boxes that he bought...it was $11 per box.
y = 9x is the function for the super saving brand...it is $9 per box
so there is a $2 difference between the original and the super saver."
Part B
"original box.....6 cereals
y = 11(6)
y = 66
super saver....6 cereals
y = 9(6)
y = 54
66 - 54 = 12.....so Luke saves $12 per month by buying the super saver brand."
The answer is also here:
https://brainly.com/question/1572338
-hope it helps