Suppose that the credit remaining on a phone card (in dollars) is a linear function of the total calling time (in minutes). When graphed, the function gives a line
with a slope of - 0.13. See the figure below.
There is $32.86 in credit remaining on the card after 22 minutes of calls. How much credit will there be after 35 minutes of calls?
Remaining
credit
(in dollars)
크
22
32.86
Calling time
(in minutes)
$0
X