The temperature at which water starts to boil is called its boiling point and is linearly related to the altitude. Water boils at 212°F at sea level and at 193.6°F at an altitude of 10,000 feet. ​(a​) Find a relationship of the form T=mx+b where T is degrees Fahrenheit and x is altitude in thousands of feet. ​(b​) Find the boiling point at an altitude of 3,100 feet. ​(c​) Find the altitude if the boiling point is 201.5°F.

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Polynomials

Try substituting 1. You will get 6 and not 0. Try other real values also. What About -2? Let us check.