Question

Which set of ordered pairs is a function?

(1,2) (3,4) (5,6) (3,-4)

(8,4) (4,3) (2,2) (8,1)

(2,5) (3,10) (4,15) (5,20)

(2,4) (2,3) (2,1) (2,0)

Answer 1

somewhere there is not something like this (a,b), (a,c) --> same two or more values in domain (i.e. in place of 'a').

Answer 2

**SAME two or more values in domain (i.e. in place of 'a').

Answer 3

IS NOT a function.

Answer 4

the first one is not a function because 3 maps to 4 and -4

- a one-to-many relation is not a function

Answer 5

then witch one is?

Answer 6

oh right - sorry - i misread the question

Answer 7

the third option is a function

Answer 8

thanks

Answer 9

yw