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Math Help - Graphing System of Equations w/4 variables...

  1. #1
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    Graphing System of Equations w/4 variables...

    I am helping my son. We need to graph this sytem of equations:

    a+b+c+d = 7.11

    abcd = 7.11

    Neither one of us has any clue how to begin graphing equations with four variables. His teacher mentioned using the Quadratic Method, but I don't see how. Can anyone help?

    Thanks!
    Kim
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    Quote Originally Posted by Profitweb View Post
    I am helping my son. We need to graph this sytem of equations:

    a+b+c+d = 7.11

    abcd = 7.11

    Neither one of us has any clue how to begin graphing equations with four variables. His teacher mentioned using the Quadratic Method, but I don't see how. Can anyone help?

    Thanks!
    Kim
    This is ALMOST a double post! Hmmm....

    Anyway, you need one coordinate axis for each unknown variable. Since you have 4 unknowns you will need 4 coordinate axes. As this is one more dimension than we live in, you'll have a little trouble finding the graph paper!

    Going back to the other post what the teacher was suggesting was to convert the system to
    x + y = 7.11
    x*y = 7.11
    and solving THIS system graphically. (But as I showed in the other post this doesn't give a real solution for all a, b, c, and d.)

    -Dan
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