The first step we need to take is to determine two points on the boundary line. To do that we will find the point for which x is 0 and the point for which y is 0. This is done below:
The first point is (0,9).
The second point is (3,0).
Since the signal is " less or equal", the line must be solid.
The two points are (0,9) and (3,0).
The region above the boundary line should be shaded.