Question

Which of the sets of ordered pairs represents a function?

A = {(−4, 5), (1, −1), (2, −2), (2, 3)}

B = {(2, 2), (3, −2), (9, 3), (9, −3)}

Answer 1

A relation is a set of ordered pairs (x, y). Example: The set {(1,a), (1, b), (2,b), (3,c), (3, a), (4,a)} is a relation A function is a relation (so, it is the set of ordered pairs) that does not contain two pairs with the same first component.

Answer 2

So it's just A? :0

Answer 3

to of what I said? Yeah

Answer 4

- look at the last 2 ordered pairs in set A
and check with hamoo3's post

Answer 5

Hmm.. okay, should I post the multiple choice answers?

Answer 6

yeah

Answer 7

good idea

Answer 8

http://prntscr.com/63zhk7 - I think it's only A.

Answer 9

also take a look at the last 2 pairs in B....

Answer 10

Oh okay..

Answer 11

Is it both A & B?

Answer 12

no - both A and B contain 2 pairs both with the same first component

Answer 13

The numbers at the end of my post more closer to the last numbers on A than B

Answer 14

Oh

Answer 15

So is it just A? It's a pretest so I'm not familiar with this stuff, im sorry.

Answer 16

I know it's not neither A or B, right?

Answer 17

a function does not contain pairs like (2,-2),(2, 3)

Answer 18

the first component is 2 in each pair

Answer 19

and in B the first component is 9 in the last 2 pairs

Answer 20

Okay

Answer 21

What would the answer be omg ;;w;

Answer 22

Im so confused. It's new to me

Answer 23

brb..

Answer 24

its neither A nor B

Answer 25

another way to look at it is that a relation is a function if its one-to-one or many-to-one but not one-to-many

Answer 26

(2, -2) and (2,3) are one-to many