A hot air balloon descends from an altitude of 2,000 feet at a constant rate of 90 feet per minute. The graph shows the altitude of the balloon over time. Write a linear function in the form y = mx + b to represent the situation.
90 is the rate of change because the hot air balloon descends 90 feet per minute. And 2,000 is the starting point because the hot air balloon started the descent at 2,000 feet.
