Question

PLEASE HELP/ EXPLAIN THIS!
Example: (3,1); (4,2); (5,1) is a function
(1,2); (3,5), (1,7) is a non-function

I need one set that is a function and one that is not

Answer 1

Do you need help explaining what is a function and what is not?

Answer 2

A function has one set of x values per set of y values. Therefore, they cannot be duplicates of the same x-value as seen in the second example. The x-value (1), shares two y values (2) and (7), which is not a function. You would be unable to graph it as seen here: