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Math Help - How to find if a equation is a function or not?

  1. #1
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    How to find if a equation is a function or not?

    Can someone explain to what a function is and also answer the title question for me?
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  2. #2
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    Re: How to find if a equation is a function or not?

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  3. #3
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    Re: How to find if a equation is a function or not?

    The easiest way of all:
    Graph the function. Do a "vertical line test."

    ie. If at any point you can draw a vertical line through two points, it is NOT a function.
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  4. #4
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    Re: How to find if a equation is a function or not?

    More generally, a function maps a set called the domain to another set called the codomain (or range). The vertical line test only works for functions mapping an input of several variables to the number line, but for functions such as y = x^2, this will do. If the relation fails the vertical line test, it is not a function.
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