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abb0t
 one year ago
Best ResponseYou've already chosen the best response.1Of course it's a function!

abb0t
 one year ago
Best ResponseYou've already chosen the best response.1If it passes the vertical line test, it's a function.

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

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

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

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

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

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

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

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

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

sakigirl
 one year ago
Best ResponseYou've already chosen the best response.0But, 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?

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

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

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

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

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

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

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

campbell_st
 one year ago
Best ResponseYou've already chosen the best response.1It 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...

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

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

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

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

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

campbell_st
 one year ago
Best ResponseYou've already chosen the best response.1yep... 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...

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

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

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

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

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

skullpatrol
 one year ago
Best ResponseYou've already chosen the best response.1Or 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.
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