Joehoffy
  • Joehoffy
any help boo?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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Joehoffy
  • Joehoffy
Which of the sets of ordered pairs represents a function? A = {(2, −2), (5, −5), (−2, 2), (−5, 5)} B = {(4, 2), (4, −2), (9, 3), (9, −3)} Only A Only B Both A and B Neither A nor B
Joehoffy
  • Joehoffy
@Willie579 @iGreen @nincompoop @raymonde20 @the_ocean_girl @Regular_x_Kidz @Englishguy @whpalmer4 @quickstudent @Agl202 @secret66 @dan815 @fatimab2000 @fancy.95.bling @ganeshie8
Willie579
  • Willie579
*Googles up what function is* :P

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Joehoffy
  • Joehoffy
hahahahahaha
Willie579
  • Willie579
Idk. :c
Joehoffy
  • Joehoffy
lol. it ok, im just gonna sit here in a corner and die. no worries! *dies in corner*
fatimab2000
  • fatimab2000
its think its only A
ShadowLegendX
  • ShadowLegendX
Why? ^
ShadowLegendX
  • ShadowLegendX
I think A represents \[f(x) = -x\]
fatimab2000
  • fatimab2000
if u connect the points for B it makes a trapezoid and A makes a straight line
Joehoffy
  • Joehoffy
O.o
ShadowLegendX
  • ShadowLegendX
Oh you did the test
Joehoffy
  • Joehoffy
?????????????
ShadowLegendX
  • ShadowLegendX
A way you can test to see if a given set of numbers is a function, you can do a vertical line test if it is given in the form of coordinates
ShadowLegendX
  • ShadowLegendX
Those are coordinates, so @fatimab2000 put those coordinates onto a graph, to test them
fatimab2000
  • fatimab2000
i did only a represents a function
ShadowLegendX
  • ShadowLegendX
Basically, what the vertical line test is, is that when you want to test to see if a parabola, or whatever is a function, graph it. For example |dw:1449318589915:dw|
Joehoffy
  • Joehoffy
__ __ \(-.-)/ (.)(.) ) . ( ( Y ) \ /
Joehoffy
  • Joehoffy
¯\_(ツ)_/¯
ShadowLegendX
  • ShadowLegendX
|dw:1449318631998:dw| Then you test it to see if any vertical lines cross the function at two points. If they do, then it is not a function. If all the vertical lines only cross one point on the function, then it is, in fact, truly, a function!
ShadowLegendX
  • ShadowLegendX
All the vertical lines cross the parabola at only one point , so it is a function!
ShadowLegendX
  • ShadowLegendX
Get it?
Joehoffy
  • Joehoffy
i do.
Joehoffy
  • Joehoffy
﴾͡๏̯͡๏﴿ O'RLY?
Willie579
  • Willie579
;-;
whpalmer4
  • whpalmer4
A function is a relationship where for each and every value of the independent variable (here \(x\)) there is only one value of the dependent value (here \(y\)). If you can make a list of rules describing which value to match to each possible value of the independent variable value and know what to write down for the dependent variable, you have a function. If you have to include a rule like "if \(x\) is 3, then \(y\) is 4, except sometimes it is -2", you do not have a function. Here for A = {(2, −2), (5, −5), (−2, 2), (−5, 5)} we can see that there is no question about the value of \(y\) that goes with any of the 4 values of \(x\) for which this relationship is specified. Therefore, A is a function. For B = {(4, 2), (4, −2), (9, 3), (9, −3)} we are immediately able to see that we do not have a function, because we cannot make a simple list of rules to tell our indecisive helper how to respond when we give various values of \(x\). If we say \(x=4\), our indecisive helper would not know whether to respond with \(y = 2\) or \(y=-2\), and similarly, we cannot make a rule for them to follow for \(x=9\). Therefore, B is not a function.

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