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Homework Help: Equation for y to obtain an equation that represents circle

  1. Feb 2, 2015 #1
    1. The problem statement, all variables and given/known data
    The equation that is first listed is: 2x^2 + 2y^2 = 7

    2. Relevant equations
    aejWMc6.png



    3. The attempt at a solution

    It's redefing the bottom portion therefore I think it's y=0,-2 because that is the range?
     
  2. jcsd
  3. Feb 2, 2015 #2

    phinds

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    Gold Member

    I do not get how you think that is a solution. The solution is an equation in the form of y = f(x) such that it is represented by the graph shown (the lower portion of the circle. This is trivial.
     
  4. Feb 2, 2015 #3

    BvU

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    Science Advisor
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    2017 Award

    Is there something known about x that you forgot to tell us ?
     
  5. Feb 2, 2015 #4

    RUber

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    Homework Helper

    If you use some algebra to solve the circle equation for y, you should have a ##\pm## symbol in front of the x part. You want to either choose + or - based on what the plot shows.
     
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