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Mailboxes Plus sends packages overnight for plus per ounce. United Packages charges plus per ounce. Mr. Molinari noticed that his package would cost the same to mail using either service. How much does his package weigh?  

Write equations for both brands.

total cost
weight in ounces

Mailboxes Plus:
United Packages: Write a similar equation.

Set the equations equal to each other to solve for .

Complete the tables in the eTool below to graph the results.
Click the link at right for the full version of the eTool: