Which ordered pair? (Picture Included)

Answer:
(1,9)
Step-by-step explanation:
For a function, each x value has only one y value. 2, 3, and 4 are already used up.
(1,9)
Answer:
(1, 9)
Step-by-step explanation:
(1, 9) is the only possible answer,because the others have the same domain above the question, so they can't be a function