Question

Which of the sets of ordered pairs represents a function?

A = {(3, −5), (4, 6), (−3, 9), (2, 7)}
B = {(2, 4), (−1, −7), (5, 6), (4, 3)}

Only A
Only B
Both A and B
Neither A nor B

Answer 1

Am I right with C?

Answer 2

@AZ

Answer 3

A function isn't a function when there are 2 xs that have different ys

Answer 4

\(\color{#0cbb34}{\text{Originally Posted by}}\) @snowflake0531
A function isn't a function when there are 2 xs that have different ys
\(\color{#0cbb34}{\text{End of Quote}}\)
*because of the vertical line test thing

Answer 5

Okay

Answer 6

A = {(3, −5), (4, 6), (−3, 9), (2, 7)}
are there any coordinate points where there is the same x but different y?

B = {(2, 4), (−1, −7), (5, 6), (4, 3)}

Answer 7

Yes

Answer 8

where

Answer 9

4,6 and 4,3

Answer 10

2,7 and 2,4

Answer 11

But set A and set B are different functions, don't look at them together, look at them separately

Answer 12

oh ok

Answer 13

So 3,5 and -3,9

Answer 14

3 and -3 are different x values?

Answer 15

Yes

Answer 16

so which choices it it
(which sets are functions)
Only A
Only B
Both A and B
Neither A nor B

Answer 17

So A?

Answer 18

why would B not be a function

Answer 19

Wait, so its C?

Answer 20

i think

Answer 21

@AZ Do you agree with option C?

Answer 22

Yes, that's correct

They pass the vertical line test- that is, none of them have the same x-values

https://www.desmos.com/calculator/dygojmutcy

Answer 23

Okay, thank you

Answer 24

remember

you look at each one separately

set A has no points with the same x value so it's a function

and set B has no points in it's set with the same x value, so it's also a function

Answer 25

Okay.