Mathematics, 05.05.2020 12:55 Gabilop

The target heart rate is the heartbeat rate during aerobic exercise that provides a benefit to your heart. The target heart rate for a person exercising at 70% intensity is given by the equation y = 0.7(200 - x) where y is the target heart rate in beats per minute and x is the person’s age in years.
How old is a person with a target heart rate of 133 beats per minute?
How old is a person with a target heart rate of 126 beats per minute?

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