Read each problem situation and use the different representations
to answer the questions.
y - 12x = 100
1. charlie is an avid reader and purchases e-books. for his
birthday, his grandparents want to enroll him in a book of the
month club. they plan to purchase a $100 gift certificate to
the e-book club. in their research, they found two plans with
comparable book offerings.
readers-r-us automatically loads the book of the month
onto the e-reader at the beginning of each month, and for
this service, the club charges each member $4.50 per month.
consider an equation in which y represents the amount of
money remaining in charles's account and is expressed as a
function of the number of months charlie is a member.
a second company, bookworms, presents the table shown to
illustrate their plan, given a purchase of a $100 gift certificate.
months balance ($)
100
a. identify which function has the greater rate of change.
explain your reasoning.
75
50
25
b. which plan should charlie's grandparents choose? explain
your reasoning.