Question

one to one

Answer 1

these are above the horizontal line

Answer 2

we aren't talking about the horizontal line that's already there

Answer 3

we draw our own horizontal line, and if it crosses the graph more than once

then we say it isn't one-to-one

but if it only crosses once, then it is a one-to-one function

Answer 4

but that's as long as it also passes the vertical line test

Answer 5

i cant tell if these are one to one functions

Answer 6

so before we can find out if it's a one to one function

we have to make sure it's a function

so we have to do a vertical line test

Answer 7

you draw a vertical line anywhere in the graph, if it touches the line at two points or more

then it isn't a function

Answer 8

these only touch it once

Answer 9

Good! So these are functions

Answer 10

Now to find out if it's a one to one function

draw horizontal lines anywhere on the graph

if it only touches the line once, then it is a one-to-one function

if it touches more than once, like two times or more- then it is NOT a one-to-one function
(it would still be a function but just not a one to one function)

Answer 11

they both only touch it once?

Answer 12

Exactly! Which means it's a one to one function