Section C Section C Checkpoint

Problem 1

The graph shows the altitude of a helicopter.

  1. Write an equation that represents the situation where xx is the time in minutes and yy is the altitude of the helicopter in feet.
  2. What does the slope of the line represent in this situation?
  3. A different helicopter is flying at a constant altitude of 7,000 feet. Draw a line on the same coordinate plane showing the altitude of this helicopter after xx minutes.
  4. What is the slope of this line and why does it make sense in this situation?
Show Solution
Solution
  1. y=10,000−800xy=10,000-800x (or equivalent)
  2. Sample response: The slope of the line represents how many feet the helicopter is descending, or going down, every minute.
  3.  
  4. The slope of this line is 0. This makes sense because the helicopter is not going up or down in altitude.
Show Sample Response
Sample Response
  1. y=10,000−800xy=10,000-800x (or equivalent)
  2. Sample response: The slope of the line represents how many feet the helicopter is descending, or going down, every minute.
  3.  
  4. The slope of this line is 0. This makes sense because the helicopter is not going up or down in altitude.