\"\"

\

The table is

\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \
\

x

\ 		\

y

\
\

 1

\ 		\

21

\
\

2

\ 		\

16

\
\

3

\ 		\

11

\
\

4

\ 		\

6

\
\

From the table x increases by 1, y decreases by a less each time.

\

So, this is a nonlinear function.\"\"

\

It represents a nonlinear function.