The linear function that models the total cost for x deliveries is:
[tex]y(x) = 2x + 9[/tex]
-------------------
A linear function has the following format:
[tex]y = mx + b[/tex]
In which
- m is the slope, that is, the rate of change.
- b is the y-intercept, that is, the value of y when x = 0.
In this problem:
- Fixed cost of $9 per month, [tex]b = 9[/tex].
- Cost of $2 for each delivery, thus [tex]m = 2[/tex].
The function for the total cost for x deliveries is:
[tex]y(x) = 2x + 9[/tex]
A similar problem is given at https://brainly.com/question/16270359
