The graph is

The x–coordinates represent the inputs and the y–coordinates represent the outputs. Make a table from the graph. \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \

\  x \	\ y \
\ 0 \	\ 0 \
\ 1 \	\ 1 \
\ 2 \	\ 2 \
\ 3 \	\ 3 \
\ 4 \	\ 4 \
\ 5 \	\ 5 \
\ 6 \	\ 6 \

\ Express the relation as ordered pairs.

That is, each output value is equal to the input value.

The rule of function is 

x - Coordinates of function are called domain.

 So domain is 

 Y - Coordinates of function are called range.

So range is

The rule of function is

Domain is

Range is .