Question

In the table below, x represents the miles traveled and y represents the cost to travel by train.

Miles, x
Cost, y
2
8.50
5
15.25
8
22.00
12
31.00

What is the slope of this function?

0.44
0.63
2.25
22.50

Answer 1

Slope = (change in cost)/(change in miles) = (15.25 − 8.50)/(5 − 2) = 6.75/3 = 2.25.
Answer: 2.25 (dollars per mile).