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    • Math Question

    Discussion in 'Off-Topic Lounge' started by Blah, Jul 22, 2010.

    1. Blah

      Blah Well-Known Member

      Jul 2, 2010
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      #1 Blah, Jul 22, 2010
      I know it's a stupid place to ask, but please help me out if you can.
      x=y/(y+2)
      I need to list the steps of the way to make the equation y=-2x/(x-1).
      I'm utterly stumped. I have no idea how to solve for y here. Any help is much appreciated
       
    2. da shiz wiz 19

      da shiz wiz 19 Well-Known Member

      Sep 24, 2009
      7,318
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      #2 da shiz wiz 19, Jul 22, 2010
      YESSSS MAAATHHH

      Can you use limits?
       
    3. Kamazar

      Kamazar Well-Known Member

      Dec 13, 2008
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      #3 Kamazar, Jul 22, 2010
      Last edited: Jul 22, 2010
      x = y/(y+2)

      (y+2) * x = y/(y+2) * (y+2)

      2x + xy = y

      2x = y - xy

      2x = y (1 - x)

      2x/(x-1) = y or y = 2x/(x-1)

      That's weird. Sure that negative's suppose to be there?
       
    4. ReadMyLips

      ReadMyLips Well-Known Member

      Feb 18, 2010
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      Dominos
      Minnesota
      #4 ReadMyLips, Jul 22, 2010
      WOOOO calculus. even though it wasn't needed.
       
    5. Blah

      Blah Well-Known Member

      Jul 2, 2010
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      #5 Blah, Jul 22, 2010
      Hm. There is negative sign, but this makes sense. I'll ask my teacher if there's a typo. Thanks so much
       
    6. Blah

      Blah Well-Known Member

      Jul 2, 2010
      334
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      #6 Blah, Jul 22, 2010
      Matrices are quite annoying
       

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