Question

Which relations are functions and which are not functions?

1. {(3, 7), (3, 6), (5, 4), (4, 7)}
2. {(1, 5), (3, 5), (4, 6), (6, 4)}
3. {(2, 3), (4, 2), (4, 6), (5, 8)}
4. {(0, 4), (3, 2), (4, 2), (6, 5)}

Answer 1

it would the b because the 6 repeats two times

Answer 2

the x can only be in the function once

Answer 3

so it's B

Answer 4

by the way...

Answer 5

u cute :3

Answer 6

ditto, the one's that do not have an X-REPEAT, are the functions ones

let's take a peek at the 1st one
\(\bf \large \{({\color{brown}{ 3}}, 7), ({\color{brown}{ 3}}, 6), ({\color{brown}{ 5}}, 4), ({\color{brown}{ 4}}, 7)\}\)

do you see any first-value repeated? that is, X-repeats?

Answer 7

\(\bf \{({\color{brown}{ {\Large 3}}}, 7), ({\color{brown}{ {\Large 3}}}, 6), ({\color{brown}{ 5}}, 4), ({\color{brown}{ 4}}, 7)\}\)

look closely, for any repeats