which is a function?

- anonymous

which is a function?

- schrodinger

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- anonymous

\[A. \left[ y \right]\]

- ParthKohli

The guy which has a unique mapping to it.

- anonymous

do you have a better example?

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## More answers

- Dean.Shyy

This may help: http://is.gd/PItqZG

- anonymous

That does help Dean,shy

- anonymous

\[A. x=\left[ y \right]\]
\[B. y= \left| x \right|\]
\[C. x ^{2} + y ^{2} = 49\]
\[D. x = y ^{2}\]

- nincompoop

what would be your answer ?

- anonymous

which ever one is a function. . .

- nincompoop

which do you think IS a function in the choices you've been provided?

- anonymous

D?

- nincompoop

why?

- anonymous

because it has a y. lol im so sorry. im tired!!

- nincompoop

hehehe I don't think you read the attachment that was shared to you. read it a little bit, will you? it will help you answer a lot of problems regarding functions

- anonymous

C?

- nincompoop

okay, you're just obviously guessing. did you read the attachment?

- anonymous

i did. but none of them look like that. or else i would have known it at first.

- nincompoop

so what do you understand about function?

- nincompoop

by the way, do you understand the [ ] and | | in A and B respectively?

- anonymous

i understand the absolute value signs but i dont know what the bracket things are

- nincompoop

brackets and curly braces are used when there are nested parentheses to avoid confusion
–{2x – [3 – (4 – 3x)] + 6x}

- anonymous

so it would be B because the graph of y = |x| passes the vertical line test??

- nincompoop

so your A is just simply x = y, which is y = x
now if you read the attachment, this could mean
f(x) = x

- anonymous

ok so it could mean f(x) = x?

- nincompoop

yes, it means that the output is the same as the input
f(x) the x inside the parenthesis, gives an output of x
f(x) = x
f(2) = 2
f(blah) = blah

- anonymous

oh ok. that makes sense now!

- anonymous

thanks! i apologize! Im soo tired!

- nincompoop

will it pass the vertical or horizontal line test?

- anonymous

if x = 2 or 3 or 4 etc. it will pass the vertical line test which means it is a function. But it will not pass the horizontal line test which means it is not a 1 - 1 function.

- anonymous

right?

- anonymous

sorry i meant y

- anonymous

x does not pass the vertical line test so it is not a function

- nincompoop

input x | output y
------------------
1 | 1
3 | 3
5 | 5
it is a 1 to 1 no matter what |dw:1365917751738:dw|

- Directrix

>> which is a function?
@kaylalynn
A function f is the set of ordered pairs (x,y) such that if (x1, y1) AND (x1,y2) are elements of f, then y1 = y2.

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