please help :)
Function or not a function? one to one or many to one? please explain! Pictures attached.

Question

please help :)
Function or not a function? one to one or many to one? please explain! Pictures attached.

mertsj · Answer

A function is a relation in which no two ordered pairs have the same first number.

anonymous · Answer

Sorry, i'm having a hard time uploading photos. There are specific ones I don't get

anonymous · Answer

attachment

anonymous · Answer

attachment

anonymous · Answer

is the first picture a function? I know the rest but not sure if they're one to one or not

myininaya · Answer

the first picture is just a picture of one graph right?

anonymous · Answer

yup!

myininaya · Answer

Anyways have you ever heard of a vertical line test?

anonymous · Answer

yeah, but i'm still not sure about that one :/

myininaya · Answer

the holes you see there means the function isn't actually defined there 
do you know that?

anonymous · Answer

nope, i'm confused

myininaya · Answer

for example:
|dw:1435801685311:dw|
f(1)=1