Is It A Function? - Printable Version

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Is It A Function? - sidhu123 - 12.09.2009

Hey! I'm doing my grade 12 Advanced Functions homework, and I need some help.

Is 3x^2 + 2y = 6 a function?

Is y = 2x a function?


Thanks!

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Re: Is It A Function? - Cueball - 20.09.2009

Functions, by definition, can only give one possible y-value for any given x-value. A vertical parabola is an example of a function. A horizontal parabola however is not a function as it has more than one possible y-value for a single x-value.
Your first example may be a function, though I think it is a poor example. Your second one is a true function, which could be written as:
f(x) = (1/2)y

Just check it out, and I hope you got your homework done

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Re: Is It A Function? - brett7 - 20.09.2009

im doing the same stuff at my school to D:

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