Suppose that the weight (in pounds) of an airplane is a linear function of the total amount of fuel (in gallons) in its tank. When graphed, the function gives a line with a slope of 6.0. See the figure below.With 46 gallons of fuel in its tank, the airplane has a weight of 2276 pounds. What is the weight of the plane with 81 gallons of fuel in its tank?AmountoffuelingallonsAirplaneweightinpounds462276pounds
Question
Suppose that the weight (in pounds) of an airplane is a linear function of the total amount of fuel (in gallons) in its tank. When graphed, the function gives a line with a slope of 6.0. See the figure below.With 46 gallons of fuel in its tank, the airplane has a weight of 2276 pounds. What is the weight of the plane with 81 gallons of fuel in its tank?AmountoffuelingallonsAirplaneweightinpounds462276pounds
Solution
The weight of the airplane is a linear function of the amount of fuel in its tank. This means that for every gallon of fuel added, the weight of the airplane increases by the slope of the line, which is 6.0 pounds per gallon.
Here are the steps to find the weight of the airplane with 81 gallons of fuel:
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First, find out how much weight the fuel adds to the airplane. To do this, subtract the amount of fuel already in the tank (46 gallons) from the amount you want to know the weight for (81 gallons). This gives you the additional amount of fuel added, which is 81 - 46 = 35 gallons.
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Next, multiply this additional amount of fuel by the weight added per gallon (the slope of the line). This gives you the additional weight added to the airplane, which is 35 gallons * 6.0 pounds/gallon = 210 pounds.
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Finally, add this additional weight to the weight of the airplane with 46 gallons of fuel. This gives you the weight of the airplane with 81 gallons of fuel, which is 2276 pounds + 210 pounds = 2486 pounds.
So, the weight of the airplane with 81 gallons of fuel in its tank is 2486 pounds.
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