Which set of data represents y as a function of x?

Answer:
B.
Step-by-step explanation:
All of them failed either the vertical line test or has the same domain (x)
Hope this helps!
Answer:
B. {(5,2), (3,4), (1, 2), (-1, -4)}
Step-by-step explanation:
B is the only one that doesn't have a repeated domain or x value like the other ones