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
Cost ($)
70
60
50
40
30
20
10
0
5
10
Data Usage (megabytes)
15
Which equation represents the cost of Jake's cell phone bill, y, based on his
data usage in megabytes, x?