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    MATHSTAR's Avatar
    MATHSTAR Posts: 1, Reputation: 1
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    #1

    Jan 17, 2008, 05:58 PM
    Determing A function by an equation
    I'm SOOO CONFUSED!!

    How do I determine an equation is a function or not by looking at an equation

    example:
    x^2 +2y=3
    I tried to slove this equation by getting y by its self but I don't know what to do with the answer! I need help I have an exam tomorrow!
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #2

    Jan 18, 2008, 02:19 PM
    If you solve for equation for y, you get:



    This is a quadratic, more specifically, a concave down parabola.

    An equation is not a function if one unique input can get you 2 or more different outputs.

    For instance,
    . This is not a function because if x=9, then y can equal 3 or -3.

    Is your parabola a function?

    There's lots of info on the net if you Google.
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