The relationship between altitude and the boiling point of a liquid is linear. At an altitude of 8300 ​ft, the liquid boils at 205.04°F. At an altitude of 4300 ​ft, the liquid boils at 209.84°F. Write an equation giving the boiling point b of the​ liquid, in degrees​ Fahrenheit, in terms of altitude​ a, in feet. What is the boiling point of the liquid at 2500 ft?