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Math Help - am i doing this right?

  1. #1
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    am i doing this right?

    An airplane cruises at 120 km/h in still air. one day, when the wind was blowing steady from the west, the airplane travelled west (flying into the wind) and landed at its destination after 1.5 g. The airplanes return trip (flying with the wind) was only 1.0h long. On both legs, the airplane travelled at its cruising speed (measured with respect to the air surrounding the airplane)

    a)Write a system of equations that would allow you to determine the speed of the wind blowing that day and the distance travelled each way.
    d= 1.5 (120-x)
    d= 1(120+x)

    b) When solving the system of equations graphically, what equations would you enter into the equation editor? Fill in the blank calculator display.
    y1=(120-x)1.5
    y2= (120+x)1

    c) Indicate what the variable X and Y represent.
    x represents the windspeed, and y(d) represents the distance (y=)
    Last edited by daniiellem; February 29th 2008 at 01:16 AM. Reason: please help me, i really need a good mark on this assignment as its worth a lot of marks.
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  2. #2
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    Quote Originally Posted by daniiellem View Post
    An airplane cruises at 120 km/h in still air. one day, when the wind was blowing steady from the west, the airplane travelled west (flying into the wind) and landed at its destination after 1.5 g. The airplanes return trip (flying with the wind) was only 1.0h long. On both legs, the airplane travelled at its cruising speed (measured with respect to the air surrounding the airplane)

    a)Write a system of equations that would allow you to determine the speed of the wind blowing that day and the distance travelled each way.
    d= 1.5 (120-x)
    d= 1(120+x) Mr F says: You should note that the right hand side simplifies to 120 + x.

    b) When solving the system of equations graphically, what equations would you enter into the equation editor? Fill in the blank calculator display.
    y1=(120-x)1.5
    y2= (120+x)1 Mr F says: (120 + x)1 is the same as 120 + x. The 1 is not necessary.

    c) Indicate what the variable X and Y represent.
    x represents the windspeed, and y(d) represents the distance (y=)
    Looks fine.
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