A function can be defined in the following six ways:

1. By a verbal rule:
Total cost of roses when the unit price is $3.

2. As an equation: y = 3x.

3. As a set of points:
(0, 0), (1, 3), (2, 6), (3,9).

4. As a table:

Input, x	0	1	2	3	4	5
Output, y	0	3	6	9	12	15

5. As a diagram: FunctionDiagram

6. As a graph: FunctionGraph

CONCEPT CHECK: Out of the 6 representations, the one showing the best that the function's values are increasing is representation number: