The temperature at which water starts to boil is also linearly related to barometric pressure. Water boils at 212°F at a pressure of 29.9 in Hg (inches of mercury) and at 191°F at a pressure of 28.4 in Hg.
(A) Find a relationship of the form T = mx + b, where T is degrees Fahrenheit and x is pressure in inches of mercury.
(B) Find the boiling point at a pressure of 31 in Hg.
(C) Find the pressure if the boiling point is 199°F.
(D) Graph T and illustrate the answers to (B) and (C) on the graph.