The phone company, NextFell, has a monthly cellular plan where the customer pays a flat monthly fee and then a cost of money per minute used on the phone. If the customer uses 240 minutes, the monthly cost is
$81.00
. If the customer uses 540 minutes, the monthly cost is
$156.00
. a. Find a linear model of the form
y=mx+b
, where
x
is the number of monthly minutes used, and
y
is the total monthly cost of the NextFell plan.
y=
b. Using the equation from part a., find the total monthly cost if 942 minutes are used. If 942 minutes are used, the total cost will be dollars.