Question

Which relation is not a function?

1
2
-8
A
→B B
DOC
2
4
-10
3
EC
6
12
(1)
(3)
A
4
6
10
B
H
F
3
8
412
с
(2)
(4)

Answer 1

4 is not a function.6 is paired with two values, 10 and 12. A function is a relation for which values you put can only be paired with exactly one value.