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Mathematics 12 Online
OpenStudy (anonymous):

At Hans's auto shop, it takes him 9 minutes to do an oil change and 15 minutes to do a tire change. Let x be the number of oil changes he does. Let y be the number of tire changes he does. Using the values and variables given, write an inequality describing how many oil changes and tire changes Hans can do in at most 2 hours (120minutes).

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