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Math Help - troublesome algebra

  1. #1
    Newbie
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    Nov 2009
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    troublesome algebra

    I'm trying to help a younger relative with some maths but I'm stumped on a question. Can anyone help?

    Part of the graph y=4/x is shown on the opposite grid. Draw a straight line on

    the grid which will enable you to solve the equation 2x - 9x + 4 = 0

    Thanks!
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  2. #2
    Senior Member
    Joined
    Nov 2009
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    277
    Thanks
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    A suggestion

    You're trying to solve:
    <br />
2x^2 -9x + 4 = 0<br />
    So rewrite this as:
    <br />
4 = 9x -2x^2<br />
    Divide by x to get
    <br />
4/x = 9 - 2x<br />
    So plot the line 9-2x on your graph and see where it intersects the 4/x curve.
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