Question

Which relations are functions?

Select Function or Not a function for each graph.

Answer 1

basically you do something called the "vertical line test"

if you can find a place, anywhere, where a perfectly vertical line crosses the graph multiple times, then it's not a function

otherwise, if there are no places where any vertical line crosses more than once, then it is a function

as a hint out of your 4 choices, 2 are functions 2 are not