Some of the values of two functions, $f$ and $g$, are given in the following table:
$x\ $ \t $-2$ \t $-1$ \t $0$ \t $1$ \t $2$ \\ $f(x)$ \t $%0$\t $%1$\t $%2$\t $%3$\t $%4$ \\ $g(x)\ $ \t $%5$\t $%6$\t $%7$\t $%8$\t $%9$ One of these functions is linear, and the other is exponential. Which is which?

$f(x)$ is RADIO with equation BOX.
$g(x)$ is RADIO with equation BOX.