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Mathematics 19 Online
OpenStudy (anonymous):

Need help with linear systems!!! Your classmate is starting a new system program. He is planning to ride his bike 60 minutes every day. He burns 7 calories bicycling at 11 mph, and 11.75 bicycling at 15 mph. How long should he bicycle at at each speed to burn 600 calories? Step by step help would be appreciated :3

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