Question

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

Answer 1

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

Answer 2

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

Answer 3

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

Answer 4

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

Answer 5

yup!

Answer 6

Anyways have you ever heard of a vertical line test?

Answer 7

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

Answer 8

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

Answer 9

nope, i'm confused

Answer 10

for example:

f(1)=1