Example 5

A Boeing 747 starts out a long flight with about 57,260 gallons of fuel in its tank. The airplane uses an average of 5 gallons of fuel per mile. Write an equation that models the amount of fuel remaining in the tank over the course of the flight. Graph the equation using a graphing calculator, and then draw the resulting graph on graph paper.
  1. Read the problem statement and then reread the problem, determining the known quantities.
  2. Identify the slope and the y-intercept.
  3. Graph the equation on your calculator.
  4. Draw the resulting graph on graph paper.
This applet is provided by Walch Education as supplemental material for their mathematics programs. Visit www.walch.com for more information on their resources.