The cost of Jake's cell phone bill is determined by how many megabytes of
data he uses each month, as shown in the graph below.
Jake's Cell Phone Bill
70
60
50
40
30
20
10
0
5
10
Data Usage (megabytes)
A. y = 0.5x + 40
B. y = 2x + 40
C. y 40x + 0.5
D. y = 40x + 2
15
X
Which equation represents the cost of Jake's cell phone bill, y, based on his
data usage in megabytes, x?