How do i know if a relation is a function on a graph ?I don’t quite understand the explanation on the pic.

If a vertical line is moved across the graph and, at any time, touches the graph at only one point, then the graph is a function. If the vertical line touches the graph at more than one point, then the graph is not a function. Hope this gives you a better understanding!! :)

Step-by-step explanation:

c. (3,2,6) is the answer.

unless if u could do my questions, if not i wouldn't want to