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Math Help - Graphing utility

  1. #1
    Amy
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    Graphing utility

    I have this problem.

    You buy a personal watercraft for $8100
    The depreciated value y after t years is y = 8100-929(t), for 0

    (a) Use the constraints of the model to graph the equation using an appropriate viewing window.
    (b) Use the zoom and trace features of a graphing utility to determine the value of t when y = 5545.25. Verify your answer algebraically.
    (c) Use the value feature or the zoom and trace features of a graphing utility to determine the value of y when t = 5.5. Verify your answer algebraically.

    Which graphing utility should I use. I have mathGV and graphmatica. But don't know how to see the graph since the y values are very high .

    Any one can help please?
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  2. #2
    Amy
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    I drew the graph in graphmatica. Given below.
    But how to find the t value when y=5545.25 from the graph?
    seems very difficult.
    Attached Thumbnails Attached Thumbnails Graphing utility-graph.jpg  
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  3. #3
    Bar0n janvdl's Avatar
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    Quote Originally Posted by Amy View Post
    I drew the graph in graphmatica. Given below.
    But how to find the t value when y=5545.25 from the graph?
    seems very difficult.
    Try Graph by Ivan Johannsen (Download here)
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  4. #4
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    In Graphmatica options menu switch off autosquare.

    You should then be able to get a suitable view of the bit of the graph that you want.
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