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abb0tBest ResponseYou've already chosen the best response.1
Of course it's a function!
 one year ago

abb0tBest ResponseYou've already chosen the best response.1
If it passes the vertical line test, it's a function.
 one year ago

sakigirlBest ResponseYou've already chosen the best response.0
I checked the answer key, and it's not a function..
 one year ago

skullpatrolBest ResponseYou've already chosen the best response.1
Have you checked the definition of a "function"?
 one year ago

skullpatrolBest ResponseYou've already chosen the best response.1
What does does it say?
 one year ago

sakigirlBest ResponseYou've already chosen the best response.0
A function is a special relationship between values: Each of its input values gives back exactly one output value.
 one year ago

skullpatrolBest ResponseYou've already chosen the best response.1
Set up a table of values like ...3, 2, 1, 0, 1, 2, 3, .. and test it.
 one year ago

sakigirlBest ResponseYou've already chosen the best response.0
How does that let me know whether it's a function or not?
 one year ago

sakigirlBest ResponseYou've already chosen the best response.0
lol, it's just a question
 one year ago

skullpatrolBest ResponseYou've already chosen the best response.1
Does each input value give "back exactly one output value."???
 one year ago

sakigirlBest ResponseYou've already chosen the best response.0
Oh, I understand now! Thanks :)
 one year ago

sakigirlBest ResponseYou've already chosen the best response.0
But, won't I have to try out all of the numbers? What if somewhere along the line, the x has more than one y value?
 one year ago

campbell_stBest ResponseYou've already chosen the best response.1
are you sure you haven't entered the equation incorrectly perhaps it should be \[x= y^2 + 4\]
 one year ago

sakigirlBest ResponseYou've already chosen the best response.0
No, that is incorrect. The y value is always the output.
 one year ago

sakigirlBest ResponseYou've already chosen the best response.0
omg it's just a correctionnn
 one year ago

campbell_stBest ResponseYou've already chosen the best response.1
no its a graph that looks like dw:1359706698575:dw
 one year ago

sakigirlBest ResponseYou've already chosen the best response.0
Well, that's the reflection of y=x^2+4 over the y axis, but no that's not correct. I have the answer key
 one year ago

skullpatrolBest ResponseYou've already chosen the best response.1
Once you try a few input values you will be able to draw a "graph" like above...
 one year ago

sakigirlBest ResponseYou've already chosen the best response.0
Wait @campbell_st how did you get that graph?
 one year ago

campbell_stBest ResponseYou've already chosen the best response.1
It the graph of \[x = y^2 + 4\] which isn't a function and that's why I asked if you had typed in the correct equation. Because the equation you have entered for the question is definitely a function...
 one year ago

sakigirlBest ResponseYou've already chosen the best response.0
Oh yes! Yes, that is what I meant. I have a question for you!
 one year ago

skullpatrolBest ResponseYou've already chosen the best response.1
Once you try a few input values you will be able to draw a "graph" of the output values.
 one year ago

sakigirlBest ResponseYou've already chosen the best response.0
how do you get function for this line? dw:1359707035624:dw
 one year ago

sakigirlBest ResponseYou've already chosen the best response.0
*how do you get the function for this line
 one year ago

sakigirlBest ResponseYou've already chosen the best response.0
Like, how did you know it was x=y^2+4?
 one year ago

campbell_stBest ResponseYou've already chosen the best response.1
yep... so as @abb0t said... if you use a vertical line you can see it cuts the curve twice... so its not a function... if the vertical like only cuts once you have a function...
 one year ago

sakigirlBest ResponseYou've already chosen the best response.0
For all we know, couldn't it have been y=(x+4)^2
 one year ago

campbell_stBest ResponseYou've already chosen the best response.1
because you said that the answer was... not a function.. which to me you have transposed the x and y.... just an experience thing
 one year ago

sakigirlBest ResponseYou've already chosen the best response.0
The vertical line test made it so much easier! So @abb0t was correct in the first place :P
 one year ago

campbell_stBest ResponseYou've already chosen the best response.1
and any parabola with x as the independent variable will be a function..
 one year ago

sakigirlBest ResponseYou've already chosen the best response.0
Thank you :) You made it clear for me
 one year ago

skullpatrolBest ResponseYou've already chosen the best response.1
Or the answer key is wrong...the important thing is to know to use the definition: A function is a special relationship between values: Each of its input values gives back exactly one output value.
 one year ago
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