Question

Please help? :)

Answer 1

This is a review thing for math finals.

Answer 2

for a function all the elements of domains must have only one image.and all be used

Answer 3

You can tell if something is a function or not by seeing if there are more than one y value for an x value. IF there are, then it isn't a function.

Answer 4

So for the first one, what do you think?

Answer 5

2 and 3 are functions

Answer 6

Also:
http://www.virtualnerd.com/algebra-1/relations-functions/functions/function-notation/identify-difference

Answer 7

Whoa i didnt realize people were on my question haha. Lemme read what you just said @Otterthecat

Answer 8

I think 4. is not a function. Right?

Answer 9

and 1 is a function..?

Answer 10

Wait one sec

Answer 11

I dont know lol

Answer 12

Okay, okay. Did you watch the video? Cause it should explain everything to you :) \

Answer 13

Yeah I did lol Im gonna watch it again.

Answer 14

You're right when you say number 4 is not a function-because the y value repeats itself, with different x values for each one.

Answer 15

Yeah thats what I was thinking

Answer 16

Was I wrong about 1?

Answer 17

Nope, you were right :)

Answer 18

Oh! hah

Answer 19

Then 2 and 3 are functions?

Answer 20

Mmhmm.

Answer 21

Cool, can you help me with one more? Im really confused about this next question

Answer 22

Fire away.

Answer 23

Alright thanks. :)

Answer 24

Determine which relation is a function.

Answer 25

Oh. Well that's when you think about the same rules-x can't repeat. So you perform the line test: a vertical line, and sweep across the graph. If there are two points at one part where it touches, it isn't a function.

So, D.

Answer 26

Same as this one?

Answer 27

Again, vertical line test.
Just put your finger up to it- if it touches more than one point per x, it's not a function. So.
D again.

Answer 28

Yaay! Thats what I got :D

Answer 29

Huzzah :D

Answer 30

This is an equation..

Answer 31

Oh-sorry-I left for a bit.

Easy-you just look at the slope and the intercept. the intercept is -1. The graph, due too the way it's positioned, is positive. So..

3x-1, D