Which is not a function?
Can give brainliest!!

Answer:
Number #1
Step-by-step explanation:
#1 isn't a function
Answer:
Choice 3 is not a function.
Step-by-step explanation:
Reason: It has points (1,3) and (1,7). X cannot repeat otherwise it is not a function.
Hope this helps!
If not, I am sorry.