Solving Systems of Equations by Substitution · Exercise 52
When Gloria spent 15 minutes on the elliptical trainer and then did circuit training for 30 minutes, her fitness app says she burned 435 calories. When she spent 30 minutes on the elliptical trainer and 40 minutes circuit training she burned 690 calories. Solve the system for , the number of calories she burns for each minute on the elliptical trainer, and , the number of calories she burns for each minute of circuit training.
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OpenStax, Elementary Algebra 2e · §5.2 Solving Systems of Equations by Substitution · Exercise 52
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