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Help on Parametric Equations

  1. Feb 17, 2013 #1
    If x = t, y = 2t, and y ≠ f(x), how to graph these equations?
     
  2. jcsd
  3. Feb 17, 2013 #2

    mfb

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    Plot a point for every t.
    Alternatively, calculate y=f(x).
     
  4. Feb 17, 2013 #3

    mathman

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    Your condition y ≠ f(x) doesn't make sense. The definitions you give for x and y imply y = 2x, which is easily graphed.
     
  5. Feb 18, 2013 #4
    In this case, y is ≠ f(x).
     
  6. Feb 18, 2013 #5

    jbriggs444

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    Possibly what you mean to say is that no function has been given for y in terms of x.

    In some cases it is true that no function exists for y in terms of x. This would be because there are some values of x that pair up with more than one value for y. However, in the case at hand, it is trivial to find an f() such that y = f(x).
     
  7. Feb 18, 2013 #6

    mathman

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    f(x) = 2x. What does your assertion mean?
     
  8. Feb 18, 2013 #7

    phion

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    Maybe he meant for y ≠ t?
     
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