SOLUTION: Sketch a graph of a relation that is not a function. Explain why it is not a function. I don't even know how to graph a function that is a relation. I just need a example. Bu

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Question 338737: Sketch a graph of a relation that is not a function. Explain why it is not a function.
I don't even know how to graph a function that is a relation.
I just need a example. But the explainion would be greatly appreciated.
Thanks.
Found 2 solutions by stanbon, Alan3354:
Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website!
Sketch a graph of a relation that is not a function. Explain why it is not a function.
I don't even know how to graph a function that is a relation.
I just need a example. But the explainion would be greatly appreciated.
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A circle is a relation and is not a function.
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It is a relation because it is a set of ordered pairs.
It is not a function because for each x value there
are two y values.
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Draw a circle with center at the origin and radius of 5.
The equation is x^2 + y^2 = 25
y = +/-sqrt[25-x^2]
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If x = 1 y = +/-sqrt(24)
Notice that this x value has two correspondeing y values.
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Cheers,
Stan H.

Answer by Alan3354(69443) (Show Source):
You can put this solution on YOUR website!
is a relation, but not a function.
It's not a function because there is not a 1 to 1 relationship of values.
ie, you can sub +1 and -1 for x (or y) and find the same value for the other variable.
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To graph, dl the FREE software at http://www.padowan.dk.com
Use F6 to enter a relationship.