### Home > CAAC > Chapter 5 > Lesson 5.1.3 > Problem 5-31

5-31.

Write equations for both brands.*y* = total cost*x* = weight in ounces

Mailboxes Plus: *y* = 0.25*x* + 5

United Packages: Write a similar equation.

Set the equations equal to each other to solve for *x*.

Complete the tables in the eTool below to graph the results.

Click the link at right for the full version of the eTool: AC 5-31 HW eTool