An airplane at 30,000 feet begins its descent. The plane descends 500 feet per minute. Write an equation in the form y = mx + b to model the height of the plane during its descent.
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Answer:
f = feet above ground
r = rate of descent
m = minutes
f = 30000 - r · m
f = 30000 - 20000m
After five minutes:
f = 30000 - 2000(5)
f = 30000 - 10000
f = 20000
After five minutes the plane is at 10,000. feet
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