Question 227127: y2=7-x2 is this an function
Answer by RAY100(1637)   (Show Source):
You can put this solution on YOUR website! y^2 = 7-x^2
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x^2 +y^2 =7
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This is a circle, center at origin,,(0,0), and radius sqrt 7
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To be a function, there can be only one value of y for each x value, not so in this case.
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The other test for a function is the vertical line test,,,when moving a vertical line along the x axis, it should intersect only one value of y,,,,again not so in this case
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Therefore, we have a relationship, not a function.
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