Find the slope and a point on the line
y-9=-1/-3(x-4)

The equation of the line given above is in a form, y - y1 = m(x - x1). It is known as the point - slope form where m is the slope. 

From the given above, m = -1/-3 which can be simplifed into m = 1/3. Thus, the slope of the line is 1/3. 

To find a point in a line, you may equate x to zero and solve for y. Which gives an answer of 7 2/3. Thus, one point on the line is (0, 7 2/3). 

The volume is 2212m cubed