Question

Construct an equation and then use it to solve the problem.

(a) Pressure P is directly proportional to temperature T, and P is 25 lb per square inch when T is 75 degrees Fahrenheit. What is the pressure when the temperature is 91 degrees Fahrenheit?

Round answer to 3 decimal places.

Answer 1

P = kT
kT = P
k = P/T
= 25/75, since P = 25 lb/in^2 and T = 75
= 1/3

P(91) = k(91)
= (1/3)(91)
= 91/3

Ans. P(91) is about 30.333