Answer:
B
Explanation:
Well, since according to the definition a function f is a relation that associates each element of one set, namely A to members of another set namely B. Just like the picture below.
As we check the table let's deal with the options
A. Yes, because the x-value are positive numbers False
Wrong! We can have on the Domain negative x-values
B. Yes, because every x-value corresponds to exactly one y-value True
This goes exactly like what's been discussed on top, the definition.
C. No, because each x-value is different False
Every function has different x-values
D. No, because none of the y-values are the same False
A Constant function all values for y are the same. A linear function has different values for y and both are functions.