Each day Kyle buys a cup of soup and a salad for lunch. The salad costs a
certain amount per ounce. The equation below models the total cost of
Kyle's lunch.
y 0.45x + 3,75
a. What do the variables x and y represent? Use the phrase is a function of
to describe how the equation relates these quantities to one another,
b. What does the value of the function for x = 0 represent?
c. What does the rate of change represent?
d. What is the cost of an 8-ounce salad without soup? How do you know?