Question

Which set of ordered pairs represents a function?

{(0, 1), (1, 2), (2, 3), (3, 3)}
{(0, 1), (1, 2), (1, 3), (2, 5)}
{(0, 0), (1, 2), (2, 4), (2, 6)}
{(0, 0), (0, 1), (2, 0), (2, 4)}

Answer 1

A function can only use each x-coordinate once.
If you see a set of ordered pairs in which two ordered pairs have the same x-coordinate, then that is not a function.

Answer 2

thank you!

Answer 3

Did you get an answer?

Answer 4

i got C

Answer 5

You're welcome.

Answer 6

That is incorrect.
Did you read my explanation carefully?

Answer 7

The x-coordinate is the first number in an ordered pair.
In the ordered pair (9, 15), 9 is the x-coordinate.
Ok so far?

Answer 8

yea that is what i messed up on wrong column

Answer 9

Here is option A of your problem:
{(0, 1), (1, 2), (2, 3), (3, 3)}
Can you just list the x-coordinates of option A?

Answer 10

0,1,2, and 3

Answer 11

is it B

Answer 12

Remember, an ordered pair is typically (x, y)
x followed by y, just like in alphabetical order where x is before y.
You are correct.
Notice that the x-coordinates of option A are all different.
That makes option A a function.
Notice that in all other options, there is always at least one x-coordinate that is repeated.
Options B, C, and D are not functions.

Answer 13

ohh, ok i get it now. Thanks again

Answer 14

You're welcome.