PLEASE HELP! An airplane flying at an altitude of 18,000 feet has just begun its descent, and it will descend at a rate of 450 feet per minute.

Which of these equations represents the airplane's altitude, y, in feet after it has been descending for x minutes?

A. y equals negative 450 x minus 18,000

B. y equals negative 450 x plus 18,000

C. y equals 450 x minus 18,000

D. y equals 450 x plus 18,000

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