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X + y = z (constant) - what variation is that?

  1. Jun 18, 2012 #1
    I have the equation x + y = z. Z is a constant. What type of variation is expressed here?

    An example of direct variation is x*z = y.
    An example of inverse variation of x * y = z.
    In both examples, z is a constant.

    So what's the answer?
     
  2. jcsd
  3. Jun 18, 2012 #2
    Direct and indirect variations are essentially proportions, right? How are you using addition?
     
  4. Jun 19, 2012 #3

    HallsofIvy

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    There is no "proportion" here.
     
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