Vertical Line Test & Functions

A function is a relationship whwere each x has only one partner value y.

Ex1

x

-2

-1

0

1

2

y

6

4

2

0

-2

This is a function as each x value has a unique value for y

Ex2

x

2

1

0

1

-1

y

3

3

4

5

7

This is NOT a function as 1 has two different partners.

The Verical Line Test- If a vertical line crosses a function more than once, it is NOT a function

Vertical Line Test and Functions