PLZZZ HELPS ME I WILL GIVE BRAINLIEST! Which relations are functions?

Select Function or Not a function for each graph.

The first 3 are functions. The last one is not a function

Step-by-step explanation: What you can do is the line test. If you draw a line through it, the line shouldn't touch the arrow twice. Like the last one, it touches the line twice, so it is not a function

what is the original number? you forgot to add it.