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5-31.

Write equations for both brands.
y = total cost
x = weight in ounces
Mailboxes Plus: y = 0.25x + 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