Question

Which of the following relations is a function?

(8, 1), (-2, 4), (4, 1), (8, 2)

(4, 0), (-2, 3), (8, 1), (-2, 5)

(4, 4), (-2, 2), (8, 1), (-6, 2)

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

Answer 1

Functions can only have 1 value of 'x'

Answer 2

So which one do you think?

Answer 3

C

Answer 4

@iGreen.

Answer 5

Yep, you got it.

Answer 6

thanks !

Answer 7

Functions are (x,f(x)) in this case f(x)= y
It's a single valued function if and only if (x,y) and (x,z) implies that y=z.