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math discussion/help needed

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  1. trouble trouble is offline

    Lansing, MI
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    Jan 26th, 2011 (1/26/2011 3:21pm)

    So I'm attempting to come up with governing equations for the data in the table below. Once I came up with one that works, I'm completely stuck on that solution, and am having difficulty coming up with more. I was curious to see what some of the math wizards of OT thought...here's the table:

    edit: adsfasdf jumbled data

    Here's the data:

    domain (1, 2, 3, ?, ?, 6)
    range (8, 14, ?, 24, 28, ?)
    Edited By: trouble Jan 26th, 2011 at 03:23 PM
  2. Jaybone2315 Jaybone2315 is online now Professional Couch Ruiner

    San Diego, CA
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    Jan 26th, 2011 (1/26/2011 3:23pm) in reply to trouble

    I could probably figure this out if I knew what it is I had to do.
  3. trouble trouble is offline

    Lansing, MI
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    Jan 26th, 2011 (1/26/2011 3:25pm) in reply to Jaybone2315

     
    Originally Posted by Jaybone2315 View Post

    I could probably figure this out if I knew what it is I had to do.

    Sorry. That looked rough. I'm looking for equations that work for this data set. They have to be functions (one and only one y for every x).

    For example, the one I figured out is y = 6x + 2. I'm looking for further unique solutions.
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  4. CookMeSomeGrits CookMeSomeGrits is offline

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    Jan 26th, 2011 (1/26/2011 3:26pm) in reply to trouble

    Just cheat...especially since you probably go to MSU....its too early in the day for math related activities
    Edited By: CookMeSomeGrits Jan 26th, 2011 at 03:26 PM
  5. Jaybone2315 Jaybone2315 is online now Professional Couch Ruiner

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    Jan 26th, 2011 (1/26/2011 3:31pm) in reply to CookMeSomeGrits

    So you need an equation of a line that include all those data points?
  6. trouble trouble is offline

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    Jan 26th, 2011 (1/26/2011 3:41pm) in reply to Jaybone2315

     
    Originally Posted by Jaybone2315 View Post

    So you need an equation of a line that include all those data points?

    Yes, essentially. There are probably lots of correct answers, and I'm having a difficult time coming up with any that aren't the first one I described. If you just plot points on a graph and then derive an equation, you'll get what I got (I think...). Given that there are only six data points, and it doesn't have to work for all real numbers, it should be possible to have many solutions. It's really not that big of a deal, I was just curious what others here with math knowledge (like you) thought about it.
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  7. Skyroller Skyroller is offline

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    Jan 26th, 2011 (1/26/2011 3:46pm) in reply to trouble

     
    Originally Posted by trouble View Post

    So I'm attempting to come up with governing equations for the data in the table below. Once I came up with one that works, I'm completely stuck on that solution, and am having difficulty coming up with more. I was curious to see what some of the math wizards of OT thought...here's the table:

    edit: adsfasdf jumbled data

    Here's the data:

    domain (1, 2, 3, ?, ?, 6)
    range (8, 14, ?, 24, 28, ?)

    My calculator spat out this for an equation:
    -1/3x^2 + 7x + 4/3

    Which gives a table of:

    domain (1, 2, 3, 4, 5, 6)
    range (8, 14, 58/3, 24, 28, 94/3)
  8. Jaybone2315 Jaybone2315 is online now Professional Couch Ruiner

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    Jan 26th, 2011 (1/26/2011 3:54pm) in reply to Skyroller

    You need to think of polynomials. I forget how to come up with a polynomial equation from data points, but if youre taking this class, you should be able to find that section in whatever chapter youre studying.

    Make up numbers for the unknowns, and come up with equations. Im pretty sure thats how it works. I havent done this is years and I dont feel like reteaching it to myself to help you lol.
    Edited By: Jaybone2315 Jan 26th, 2011 at 03:57 PM
  9. dodgingjets dodgingjets is offline

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    Jan 26th, 2011 (1/26/2011 4:23pm) in reply to Jaybone2315







    Edited By: dodgingjets Jan 26th, 2011 at 04:23 PM
  10. gutbirdxx gutbirdxx is offline

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    Jan 26th, 2011 (1/26/2011 4:33pm) in reply to dodgingjets

    lofuckingl dodgingjets...thankyou
  11. Fritters Fritters is offline

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    Jan 26th, 2011 (1/26/2011 5:41pm) in reply to gutbirdxx

    I'm confused - it looks like you only have 2 complete data points. You can fit those with any curve you want and you should be able to solve them analyitcally as long as they have 2 constants. For example, I tried something that looks like Ax^2+Bx=y, then I plugged in x=1, y=8 to get one equation and x=2, y=14 to get another. Solve the 2 equations for A & B and you get A=-1, B=9 so -x^2+9x=y.

    Maybe I'm not understanding the problem?
  12. stoneking89 stoneking89 is offline

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    Jan 26th, 2011 (1/26/2011 10:07pm) in reply to Fritters

    are the sequences locked? does 1 have to correspond to 8 and 2 to 14, ect or can you jumble it?
  13. Hank H1LL Hank H1LL is offline

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    Jan 26th, 2011 (1/26/2011 10:42pm) in reply to stoneking89

    hmmm well skyroller nailed it already.

    for y = 2x^2 + 6
    domain: (1, 2, 3, 3, sqrt(11), 6)
    range: (8, 14, 24, 24, 28, 78)

    you're repeating x=3 but it works.
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