Algebra 1 Homework Help

Question

If Cameron pays $15 to join the Big Books club, he gets 10% off the price of each book. He wants to decide whether to join the club. For each amount given that he spends of books, will he save money by joining the club?

a. $70
b. $250
c. $100
d. How much money does Cameron need to spend so that the cost of his books is the same whether he joins the club or not?

Answer 1

mx + b = y

m = .9

b = 15

 

I'll sort out the problems, but you'll need to look at them to see if Cam is saving money or not:

.9 * 70 + 15

63 + 15 = 78

 

.9 * 250 + 15

225 + 15 = 240

 

.9 * 100 + 15

90 + 15 = 105

 

To see how much that needs to be spent before they're equal:

.9x + 15 = x

15 = .1x

150 = x