Which of these equations represent functions?

Check all that apply.

A. y=± (minus sign under +) root of X
B. y=root of X
C. x2 - y2 = 1
D. y = (x - 1)2

Question

Which of these equations represent functions?

Check all that apply.

A.	y=± (minus sign under +) root of X
 		B.	y=root of X
 		C.	x2 - y2 = 1
 		D.	y = (x - 1)2

tkhunny · Answer

Please state the requirements.

noelgreco · Answer

Try the vertical line test on the functions' graphs.

e.mccormick · Answer

-y^2?  That is no circle.

anonymous · Answer

my mistake

e.mccormick · Answer

np.  It is not a funtion either.

anonymous · Answer

think my answers would be A,b,and D, correct me if I'm wrong,

e.mccormick · Answer

How did you graph A to check it?

anonymous · Answer

±, just means plus or minus so i did both

e.mccormick · Answer

Yes, on the same graph. Becayse the $\pm$ is outside the root, if $x=1$, $y=\{-1,1\}$

anonymous · Answer

wait so  it cant be a function right?

e.mccormick · Answer

Right. The first two here show it: https://www.desmos.com/calculator/rulzhdxw2j The other are the rest of things you needed.

anonymous · Answer

thanks a lot @e.mccormick !(:

e.mccormick · Answer

np.  have fun!