Question

Which of the following represents a relation that is NOT a function?


A.
X -8 -4 6 11
Y 26 24 32 26



B.
X 6 -4 11 -8
Y 26 24 32 26



C.
X -8 -4 -8 4
Y 26 24 32 26



D.
X -8 -4 -2 4
Y 26 24 32 26

Answer 1

I think its D

Answer 2

it c

Answer 3

It's C

Answer 4

It's actually choice C


-8 maps to both 26 and 32 at the same time

Answer 5

Aight thank you,

Answer 6

Something is a function if you can always answer the question "For a given X, what's the value of Y"?

(1, 2) (3, 2) --> What's the value if x=1? It's 2. What's the value if x=3? It's 2. Since you can always answer the question, it's a function.

(1, 8) (1, 9) --> What's the value if x=1? You don't know. it could be either 8 or 9. Therefore it's not a function.