The relationship between altitude and the boiling point of a liquid is linear. At sea level, the liquid boils at 220°F. As the altitude increases, the boiling temperature of the liquid decreases, such that at an altitude of 4,500 ft, the liquid boils at
211.45°F.

a. Write an equation giving the boiling point b of the liquid, in degrees Fahrenheit, in terms of altitude a, in feet.

b. What is the boiling point of the liquid at 22,000 ft?