At sea level, water boils at a temperature of 212F. As the altitude increases, the boiling point

Question:

At sea level, water boils at a temperature of 212°F. As the altitude increases, the boiling point of water decreases. For instance, at an altitude of 5000 feet, water boils at about 202.8°F.
(a) Find a linear equation giving the boiling point of water in terms of altitude.
(b) At what temperature does water boil at the top of Mt. Everest (altitude 29,029 feet)?