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Graph the rule .  Create a table if it will help.    

Do you notice any trends? Do the data points tend to increase or decrease as the age increases?

The data shows a negative correlation.

Use the eTool below to graph the data in the table with the age of the car on the -axis and the avg. miles per gallon on the -axis.
Click the link at right for the full version of the eTool: CC3 9-24 HW eTool