Applications
Problem 1
Answer 1
Step 1. Define the variables.
x = distance in miles
y = cost of the rental truck in dollars
Step 2. Determine the y-intercept and a point.
The y-intercept is given, the cost of the truck with 0 miles is $40 so the y-intercept is (0, 40).
Marcel pays $63 for 46 miles, representing the point (46, 63).
Step 3. Use the y-intercept (b) and the given point (x, y) to determine the function rule.
Step 4. Substitute values for m and a point into 
Step 5. To answer the question about the cost of 220 miles, substitute x = 220.
