0 00
12
30
18
12
9. A friend gave Ms. Morris a gift card for a
Number of car washes, x
local car wash. The table shows the linear
relationship of how the value left on the
Amount left on card ($), y
card relates to the number of car washes.
a. Write an equation that shows the number of dollars left on the card.
b. Explain the meaning of the negative slope in this situation.
c. What is the maximum value of x that makes sense in this context? Explain.