3. A store offers packing and mailing services to customers. If a customer ships a box
weighing 4 pounds, it would cost $9. If a
customer ships a box weighing 8 pounds, it
would cost $23. Identify the following
characteristics:
a. What is the input?
b. What is the output?
C. What is the slope? Show your work.
d. What does the slope represent in words?
e. What is the y-intercept? Show your work.
f. What does the y-intercept represent in
words?