Jerry sells a particular type of coin online. The amount he charges his customers for
the coins includes shipping. Jerry uses the equation shown below to determine the
total amount (y) in dollars, he will charge for x coins.
y = 32.95x + 12.95
Zack and Dave each bought some coins from Jerry online. Dave bought 5 more
coins than Zack bought.
C. Explain why it is not necessary to know how many coins Zack bought to determine how
much more Dave than Zack paid.
