Question 1147038
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In order for a relation to be a function, for any given element in the domain set, there is one and only one corresponding element in the range set.


So if there is a relation where for any element you choose from the domain you get exactly one answer from the range, the relation is a function.  However, if there is at least one element in the domain such that you get, "it could be this or it could be that", then it is not a function.


Graph the relation.  If you can draw a vertical line anywhere that intersects the graph more than once, then it is not a function.
								
								
John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
My calculator said it, I believe it, that settles it
<img src="http://c0rk.blogs.com/gr0undzer0/darwin-fish.jpg">
*[tex \Large \ \
*[tex \LARGE \ \ \ \ \ \ \ \ \ \  
								
{{n}\choose{r}}
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