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Equation for y to obtain an equation that represents circle

  • #1
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Homework Statement


The equation that is first listed is: 2x^2 + 2y^2 = 7

Homework Equations


aejWMc6.png
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The Attempt at a Solution



It's redefing the bottom portion therefore I think it's y=0,-2 because that is the range?
 

Answers and Replies

  • #2
phinds
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The Attempt at a Solution



It's redefing the bottom portion therefore I think it's y=0,-2 because that is the range?
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.
 
  • #3
BvU
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Is there something known about x that you forgot to tell us ?
 
  • #4
RUber
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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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