Respuesta :
Answer:
1, 2, 3
Step-by-step explanation:
If the y's (right numbers have more than one number its not a function) hope this helps! :)
Answer:
All except the 3rd one {(12, 12), (12, 13), (12, 14)} are functions
Step-by-step explanation:
In mathematics, a function from a set X to a set Y assigns to each element of X exactly one element of Y.
This means that as long as some X does not give different Y values it is a function.