Question

Question 1.1. Which relation is a function?

(Points : 4)
{(1, 2); (2, 3); (3, 4); (1, 5)}
{(1, 2); (1, 3); (1, 4); (1, 5)}
{(1, 2); (2, 3); (3, 4); (2, 5)}
{(1, 2); (2, 2); (3, 2); (4, 2)}

Answer 1

A function is a relationship in which, for every x-value, there is a UNIQUE y-value, i.e. only one y-value for every x-value. Which one do you think satisfies this requirement?

Answer 2

The second one.

Answer 3

Well, in the second one, the x-value of 1 has 4 y-values (2, 3, 4, 5). So it can't be that one.

Answer 4

Ok then it should be the last one then right?

Answer 5

Exactly. Good job!

Answer 6

Thanks.

Answer 7

You're welcome.

Answer 8

May i ask you another?