A weather balloon is ascending. While it rises, it measures the atmospheric ... ...

A weather balloon is ascending. While it rises, it measures the atmospheric pressure. Scientists monitoring the balloon discover that the air pressure decreases linearly, recording a pressure of 14.4 psi at 1000 feet and a pressure of 13.9 psi at 1500 feet. Which of the following linear functions best describes the air pressure P as a function of altitude h? (Note: psi stands for "pounds per square inch")
(A) P(h) = 5h + 13.4
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Nova Math - Problem Set N: Equations