# Equation for y to obtain an equation that represents circle

## Homework Statement

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

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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?

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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.

BvU
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.