Determine when $g(x)$ is positive, negative, increasing, or decreasing. Then describe the end behavior of the function.

A V-shaped line is plotted on a xy coordinate plane. The x and y axes range from negative 8 to 8, in increments of 2. The line passes through the following points: (negative 9, 7), (negative 3, 0), (0, 3), and (7, 9).