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Math Help - How do I figure out which equation is shown by this graph?!

  1. #1
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    How do I figure out which equation is shown by this graph?!

    I need to figure this out before I take my test! HELP!


    Here's a link to a picture of the graph: http://i14.photobucket.com/albums/a3...Picture2-9.png


    I'm pretty sure a=3, but I'm not sure how to figure out a or c, or the final equation?


    My choices are:

    a) x^2-y^2=9
    b) y^2-x^2=9
    c) x^2+y^2=9
    d) x^2-y^2=3

    How do I figure this out?!

    THANKS.
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  2. #2
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    Of the choices given three are hyperbolas and one is an ellipse.
    Eliminate the ellipse.

    Of the three remaining hyperbolas, two open right/left, eliminate them.
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  3. #3
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    Quote Originally Posted by Plato View Post
    Of the choices given three are hyperbolas and one is an ellipse.
    Eliminate the ellipse.

    Of the three remaining hyperbolas, two open right/left, eliminate them.


    Ok, thanks! C would be the ellipse, so I can eliminate that one. So would A and D open right/left? Since they start with X's?
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  4. #4
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by deathtolife04 View Post
    Ok, thanks! C would be the ellipse, so I can eliminate that one. So would A and D open right/left? Since they start with X's?
    correct

    i'd call c a circle, but i guess that's ok
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