Ok this is a little embarrasing, i can't seem to find the answer to this simple question... "Functions are said to rules on variables X and Y, are all rules functions? why?"
Cows produce milk, but is all milk produced by cows?
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Quote by saphrax
Cows produce milk, but is all milk produced by cows?

yeah, something like that but honestly i have no idea...
If there is more than one value for x, then it isn't a function. For example, y=x^2 is a function, but x=y^2 isnt. x= | y^2 | would be, though.
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Quote by Unforgotten
x = across
y= horizontal

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And this is why we don't ask the pit for homework help.

Lol. I only just read that...
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Quote by lp_std
functions cut the x axis more than once. relations do not. so no, all rules are not functions

That makes no sense, your tellin me "y=x+1" isnt a function? Im sorry but i think it is.

Quote by umop-3p!sdn
If there is more than one value for x, then it isn't a function. For example, y=x^2 is a function, but x=y^2 isnt. x= | y^2 | would be, though.

Functions dont have to have an inverse, it just means its not injective.

A function is basically a set of rules that tells you how to get from the set X to the set Y.
But all rules arent function. For example, X>0 is a rule, saying X has to be positive, but it by no means maps the set X to another set, and so isnt a function.
Quote by saphrax
Cows produce milk, but is all milk produced by cows?

+1
Quote by saphrax
Cows produce milk, but is all milk produced by cows?

Quote by Unforgotten
x = across
y= horizontal

I lol'd
O.o

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A cat has legs, a table has legs, therefore table = cat.
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A cat has legs, a table has legs, therefore table = cat.

Somebody needs to do a photoshop of that.
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