SOLUTION: Suppose that the weight(in pounds) of an airplane is a linear function of the amount of fuel (in gallons) in its tank. When carrying 16 gallons of fuel, the airplane weighs 1988 po

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: Suppose that the weight(in pounds) of an airplane is a linear function of the amount of fuel (in gallons) in its tank. When carrying 16 gallons of fuel, the airplane weighs 1988 po      Log On


   

Question 1185058: Suppose that the weight(in pounds) of an airplane is a linear function of the amount of fuel (in gallons) in its tank. When carrying 16 gallons of fuel, the airplane weighs 1988 pounds. When carrying 42 gallons of fuel it weighs 2131 pounds. How much does the airplane weigh if it’s crying 56 gallons of fuel?
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
Points are (x,y) for (amount of fuel, weight of plane).

Points described are (16,1988) and (42,2131).
You want to find the y value for x=56.

Try either linear interpolation, or find the equation of the line with the two described points and evaluate y for x=56.