Which of the following is an example of a function?
A. {(-1, 0), (-1, 3), (3, 9), (5, 10)}
B. {(1, 3), (2, 5), (3, 8), (4, 10)}
C. {(4, 6), (5, 9), (4, 7)}
D. {(0, 2), (0, 3), (1, 5), (4, 5)}

Question

Which of the following is an example of a function?
	A.	{(-1, 0), (-1, 3), (3, 9), (5, 10)}
	B.	{(1, 3), (2, 5), (3, 8), (4, 10)}
	C.	{(4, 6), (5, 9), (4, 7)}
	D.	{(0, 2), (0, 3), (1, 5), (4, 5)}

anonymous · Answer

@whpalmer4

zzr0ck3r · Answer

if you have any two points that have the same x value but different y values its not a function.

anonymous · Answer

yeah but they all do ..

zzr0ck3r · Answer

B does?

anonymous · Answer

3 ?

zzr0ck3r · Answer

we are only concerned with points that have the same x value and different y values ilke
(1,3)(1,7)
or
(2,-5)(2,6)
or
(-3,34)(-3,-56)

zzr0ck3r · Answer

so yes you have a point where a y value is 3 and an x value is 3 but that's ok

anonymous · Answer

ohh. i thought you couldnt have any of the same.

zzr0ck3r · Answer

but option B has no repeated x values, so we cant have the problem where x is paired with two different numbers.....

anonymous · Answer

okay, so then its B, like you said? cause thats what i originally thought but i second guessed it.

zzr0ck3r · Answer

nah
(3,5)(2,5) is ok
(-4,5)(5,-4) is ok
(5,7)(7,7) is ok
(4,6)(4,7) is NOT ok

zzr0ck3r · Answer

yes B is the one:)

anonymous · Answer

well thank you!