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Of course it's a function!

If it passes the vertical line test, it's a function.

Vertical line test?

I checked the answer key, and it's not a function..

|dw:1359706054639:dw|

Have you checked the definition of a "function"?

yes

What does does it say?

Set up a table of values like ...-3, -2, -1, 0, 1, 2, 3, .. and test it.

How does that let me know whether it's a function or not?

buuurn!

lol, it's just a question

Does each input value give "back exactly one output value."???

Oh, I understand now! Thanks :)

are you sure you haven't entered the equation incorrectly
perhaps it should be
\[x= y^2 + 4\]

No, that is incorrect. The y value is always the output.

BUUUUUURN!!!!

omg it's just a correctionnn

no its a graph that looks like
|dw:1359706698575:dw|

Once you try a few input values you will be able to draw a "graph" like above...

Wait @campbell_st how did you get that graph?

Oh yes! Yes, that is what I meant.
I have a question for you!

Once you try a few input values you will be able to draw a "graph" of the output values.

how do you get function for this line? |dw:1359707035624:dw|

*how do you get the function for this line

Like, how did you know it was x=y^2+4?

For all we know, couldn't it have been y=(x+4)^2

and any parabola with x as the independent variable will be a function..

yes he was...

Thank you :) You made it clear for me

|dw:1359707283237:dw|

glad to help