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Math Help - How do I write this in proper form.

  1. #1
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    How do I write this in proper form.

    In an assignment of mine we are required to plot a graph and it's table of values, the problem I'm having is the values must not be in decimal form, so for example;

    If I have the function below, and I need to find the value for y, if x=-2 how do I find that without it turning it into a decimal. The answer in the practice question says Y=-7/9. I think I understand where the 9 came from, but thats about it (3-2 = 1/9)
    y = 2(3)x 1

    Anyone care to explain?
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  2. #2
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    Re: How do I write this in proper form.

    Quote Originally Posted by Urpes View Post
    In an assignment of mine we are required to plot a graph and it's table of values, the problem I'm having is the values must not be in decimal form, so for example;

    If I have the function below, and I need to find the value for y, if x=-2 how do I find that without it turning it into a decimal. The answer in the practice question says Y=-7/9. I think I understand where the 9 came from, but thats about it (3-2 = 1/9)
    y = 2(3)x 1

    Anyone care to explain?
    Ummmmm,... Just put the -2 in?
    y = 2 \cdot 3^{-2} - 1 = \frac{2}{3^2} - 1
    and continue.

    -Dan
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    Re: How do I write this in proper form.

    I'm afraid I don't know how to continue any further.

    If the next step is

    2 -1 How do I get -7/9 out of that?
    9
    Last edited by Urpes; July 19th 2013 at 02:39 PM.
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    Re: How do I write this in proper form.

    I hate to say it but if you are taking algebra or preCalculus and can't subtract fraction you have a serious problem! Get "common denominators". You understand that 1= \frac{9}{9}, don't you? \frac{7}{9}- 1= \frac{7}{9}- \frac{9}{9}= \frac{7- 9}{9}= \frac{-2}{9}.
    Last edited by HallsofIvy; July 19th 2013 at 02:48 PM.
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    Re: How do I write this in proper form.

    Thank you!
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