Question

Check please:

Which relation is not a function?

Graph 1: http://prnt.sc/d674ml
Graph 2: http://prnt.sc/d674ne
Graph 3: http://prnt.sc/d674ou
Graph 4: http://prnt.sc/d674q9

My answer: Graph 3

Answer 1

@triciaal

Answer 2

@sshayer

Answer 3

Your are right. （ﾉ｡≧◇≦）ﾉ
Graph 3 is correct because if you place a vertical line on the graph, you can see that it is being crossed twice.

Answer 4

if a vertical line cuts the graph in more than one points then it is not a function.