## Functions: having trouble with definition in my book

Geometric formulae, word problems, theorems and proofs, etc.
iceking
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### Functions: having trouble with definition in my book

I have a definition for "functions" in my math book, but I don't understand it. The definition is "a relation in which each first coordinate is paired with exactly one second coordinate" Can someone explain it?

stapel_eliz
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Can someone explain it?
Got ya covered right here!

iceking
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Joined: Sat Sep 26, 2009 12:46 am
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### Re: Functions: having trouble with definition in my book

Thank you! Now I understand it!

iceking
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### Re: Functions: having trouble with definition in my book

Now I have another definition "dependent variable" (regarding functions) the definition is: "the variable representing the second elements of the ordered pairs in a function; the outputs." Does this basically mean "The y-values in an equation regarding that function"?

stapel_eliz
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Yes. The x-value is the "independent" variable: you, independently, choose the value of x. The y-value is the "dependent" variable: it depends on what you picked for x.

iceking
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### Re:

Yes. The x-value is the "independent" variable: you, independently, choose the value of x. The y-value is the "dependent" variable: it depends on what you picked for x.
Thanks!