anonymous
  • anonymous
Determine if the following is always, sometimes, or never true. y = -1/5 x + 3 is a function.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
The given relation is a function if, when equal to y, the graph of the equation is intersected by a vertical line only once. See photo. \[y=\frac{ -x }{ 5 }+3\] The above graph is always a function.
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Jhannybean
  • Jhannybean
PERFECT EXPLANATION
Loser66
  • Loser66
@Brenar can you give me the link of definition of function ?

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anonymous
  • anonymous
I'm sorry, can you clarify?
Loser66
  • Loser66
It's new to me, I want to know base on which foundation, we can consider whether it 's a function or not
anonymous
  • anonymous
http://en.wikipedia.org/wiki/Vertical_line_test
anonymous
  • anonymous
Thank you very much! That explanation is great. :) @Brenar
Loser66
  • Loser66
or just "cross" a vertical line?
Jhannybean
  • Jhannybean
@Loser66 http://tutorial.math.lamar.edu/Classes/Alg/FunctionDefn.aspx
Jhannybean
  • Jhannybean
Scrolldown to "working definition of a function"
Loser66
  • Loser66
thanks
Loser66
  • Loser66
@dan815 , dan when you online, answer my question here, please. I want to confirm the way we consider whether a relative is a function or not. I strongly agree with the helper above about it. My question is, there is some function doesn't work on that way, it's still a function but not onto or 1to 1. and it doesn't satisfy the vertical text above. For example: we discussed about the equation of the line x =4, now if I switch y =4, it doesn't pass the vertical test, it's a function still. I can rewrite y =4 under the form of a function f(x,4). Think about it and answer me, please. Obviously, if I ask you sketch the graph of f(x,4), you draw the line y =4. So???? Tell me what's wrong with my argument.
anonymous
  • anonymous
If you clarify what you're asking a bit more, I can try to help you out.
Loser66
  • Loser66
is f(x,4) a function?
anonymous
  • anonymous
You can't have f(x,y). f(x) is saying that f is a function of x. You could have f(y) if your function was defined in terms of y, or vice versa.
Loser66
  • Loser66
I don't think so, f(x, constant ) is an onto function, and it is a function of a horizontal line. My prof asked me define function of something like |dw:1370604739986:dw|
anonymous
  • anonymous
So you have a piecewise function \[f(x)=\left(\begin{matrix}DNE,x<10 \\ 2,x>10\end{matrix}\right)\] and you're given y=2?
Loser66
  • Loser66
nope, exactly f(x,2)
dan815
  • dan815
like a step function, theres tons of definitions for functions,
dan815
  • dan815
the most common definition is... a function is something where u input and u get an output, when you input a value of x, then you get one value of y back.. but this is still an incomplete definition, u can make a function defined in terms of y=f(x) and in that case blah vlah blah.. all u really need to know is that a function is basically.. in the form f(x,y,z,...n)=g(x,y,z,....n) basically there are operations happening to a bunch of inputs and you get an output, you say an input has been subjected to a function of g..
dan815
  • dan815
its all a bunch of BULL pellet LOL
dan815
  • dan815
i dont know why they must ask u for such definitions
dan815
  • dan815
might aswell also ask you the meaning of life

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