Question

WILL GIVE MEDAL IF CORRECT.

Determine which relation is a function.

A.
{(–3, 2), (–2, 3), (–1, 1), (0, 4), (0, 1)}

B.
{(–3, 3), (–2, 3), (–1, 1), (0, 4), (0, 1)}

C.
{(–3, 2), (–1, 3), (–1, 2), (0, 4), (1, 1)}

D.
{(–3, 2), (–2, 3), (–1, 2), (0, 4), (1, 1)}

Answer 1

You'll need to understand what distinguishes "functions" from "non-functions." Can you do that? Important to kinow, if you have to identify functions.

Answer 2

no, i'm not sure how to do that. can u explain it?

Answer 3

@adamfolt can u help please?

Answer 4

I think so one minute

Answer 5

ok thx

Answer 6

By "function" they mean that relation has no more than one y per every x.

Answer 7

okay, so can u help with the question asked?

Answer 8

that is what I am going to attempt.
9(But as you probably know, I am not allowed to just handle answers according to the site's policy))

Answer 9

would the answer be A? since, every other group has 2 of the same y values?

Answer 10

yes I understand that.

Answer 11

So if you had, FOR INSTANCE, (2,3), (2,4) somewhere in your relation.

Then for x=2, you have y=3 and y=4.
And that means that your relation would NOT be a "function".

Answer 12

When you're trying to identify functions, the important thing is that no x-value has more than one y-value associated with it. Solomon's example is very accurate.

Answer 13

HOWEVER, if your relation involved (again FOR INSTANCE) the following points: (4,5) and (6,5) ... then your relation is a function, because you have x=4 and x=6 for y=5.

And that doesn't transgress the requirement;
"no more than one y-value per every x"

(Saying that you can have multiple x's that correspond to a single y,
but NOT the other way around)

Answer 14

so is the answer A or not??

Answer 15

{(–3, 2), (–2, 3), (–1, 1), (0, 4), (0, 1)}

A has points;
(0,4) and (0,1)

so for x=0 you have multiple y-values - y=4 and 1.

Answer 16

Are you allowed to have more than one y-coordinate correspond to a single x-coordinate?

Answer 17

yes, i think so,

Answer 18

I explained that not...

Answer 19

oh yea sorry. its one y coordinate per ever x coordinate

Answer 20

therefore, it is NOT a...

Answer 21

it's not a function.

Answer 22

yes it is not "function"

Answer 23

and there's only allowed one point per vertical line?

Answer 24

yes, one point per vertical line.
(same as "no more than one y-value per a single x-value)

Answer 25

but, on horizontal line, you can have multiply points.

Answer 26

okay so then would the answer be A??

Answer 27

I thought we just agree that ....

Answer 28

agreed*

Answer 29

so yea?

Answer 30

because that's what I thought too, just making sure though.