Question

Which is the graph of the equation ?

A store offers packing and mailing services to customers. The cost of shipping a box is a combination of a flat packing fee of $5 and an amount based on the weight in pounds of the box, $2.25 per pound. Which equation represents the shipping cost as a function of x, the weight in pounds?

f(x) = 2.25x + 5
f(x) = 5x + 2.25
f(x) = 2.25x − 5
f(x) = 5x − 2.25

Answer 1

f(x) = 2.25x + 5

Explanation:

There is a base fee of five, which we can use to substitute for c, and the rate of change, or slope, is 2.25. Because we are adding the two fees together, we use a plus sign.