kaylalynn
which is a function?
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kaylalynn
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\[A. \left[ y \right]\]
ParthKohli
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The guy which has a unique mapping to it.
Speedy_Jazz
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do you have a better example?
Speedy_Jazz
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That does help Dean,shy
kaylalynn
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\[A. x=\left[ y \right]\]
\[B. y= \left| x \right|\]
\[C. x ^{2} + y ^{2} = 49\]
\[D. x = y ^{2}\]
nincompoop
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what would be your answer ?
kaylalynn
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which ever one is a function. . .
nincompoop
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which do you think IS a function in the choices you've been provided?
kaylalynn
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D?
nincompoop
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why?
kaylalynn
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because it has a y. lol im so sorry. im tired!!
nincompoop
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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
kaylalynn
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C?
nincompoop
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okay, you're just obviously guessing. did you read the attachment?
kaylalynn
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i did. but none of them look like that. or else i would have known it at first.
nincompoop
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so what do you understand about function?
nincompoop
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by the way, do you understand the [ ] and | | in A and B respectively?
kaylalynn
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i understand the absolute value signs but i dont know what the bracket things are
nincompoop
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brackets and curly braces are used when there are nested parentheses to avoid confusion
–{2x – [3 – (4 – 3x)] + 6x}
kaylalynn
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so it would be B because the graph of y = |x| passes the vertical line test??
nincompoop
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so your A is just simply x = y, which is y = x
now if you read the attachment, this could mean
f(x) = x
kaylalynn
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ok so it could mean f(x) = x?
nincompoop
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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
kaylalynn
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oh ok. that makes sense now!
kaylalynn
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thanks! i apologize! Im soo tired!
nincompoop
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will it pass the vertical or horizontal line test?
kaylalynn
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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.
kaylalynn
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right?
kaylalynn
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sorry i meant y
kaylalynn
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x does not pass the vertical line test so it is not a function
nincompoop
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input x | output y
------------------
1 | 1
3 | 3
5 | 5
it is a 1 to 1 no matter what |dw:1365917751738:dw|
Directrix
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>> 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.