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Homework Help: Parametric equation

  1. Feb 23, 2008 #1
    1. The problem statement, all variables and given/known data
    i want to make t the subject of any of the following equations inorder to find the cartesion equation. any ideas?:
    x=t^2+t
    y=t^2-t


    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Feb 23, 2008 #2
    You can assume x,y are constants and find t! (Quadratic formula )

    or use algebraic manipulations ... one is
    x-y = 2t
    once again find t
     
  4. Feb 23, 2008 #3

    arildno

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    Science Advisor
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    Well, adding the equations yields x+y=2t^2, whereas subtracting yields x-y=2t
    See if you can use this.
     
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