Question

The function y=2.5x+3 can be used to determine the cost in dollars for a taxi ride of x miles. What is the rate of change of the cost in dollars with respect to the number of miles

A. $3
B. $1
C. $2.50
D. $5.50

Answer 1

• y=2.5x+3

Compare to slope intercept form y=mx+b

• Slope=m=2.5
• y intercept=b=3

Sl

Here the rate of change is $2.50

Answer 2

C. $2.50

Explanation:

x=1 y=5.5

x=2 y=2.5