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

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

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

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

yup!

Anyways have you ever heard of a vertical line test?

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

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

nope, i'm confused

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

like f(1) is not assigned to 0

oh so does that mean it passes the vertical line test?

yep

ohh thanks! how do you tell if it's one to one?

there is a horizontal line test you can perform

if you draw a horizontal line
and more than one point lies on it then it is not one-to-one

wait so do i consider the points that aren't defined

you only considered things that are defined

is it one to one then because the other point isn't defined

|dw:1435801941050:dw|

well the second one is not even a function
do you know why?

yep doesn't pass the vertical line test

oh you mean

the second picture first graph sorry

ok thanks! i think i got the hang of it. :)

cool stuff :)