Example 1: The number of miles a car travels varies directly with the amount of gas used. 

1. What quantity will be found on the x-axis in this example? How will the constant or proportionality affect this graph? Click on the "Show graph" button to check your solution.

2. What is the constant of proportionality in this example? 

3. How many miles would you have driven if you used 1/3 of a tank of gas?  NOTE: You can move the gas gage to 1/3 of 12 gallons to check your answer.

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