After 3 minutes of exercise, Malcolm's heart rate is 80 beats per minute. After 5 minutes, it increased to 94 beats per minute. Let a represent the number of minutes since Malcolm began
exercising, and let y represent Malcolm's heart rate (assume his heart rate increased at a constant
rate). Write two linear equations (one in slope-intercept form and one in point-slope form) to
model his heart rate. Then, calculate his heart rate after 12 minutes of exercise.
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