Well in order to get the answer first, you would the heighth (40) and multiply it by the radius (16) so..... 40 x 16= 640 then .... V= 640 That is how you find the volume
If you are looking for the equation, then it would be y = -x+3
This is the same as y = -1x+3 which is in slope intercept form y = mx+b
m = -1 = slope
b = 3 = y intercept
If you want to graph this, then plot the points (0,3) and (1,2). Then draw a straight line through them both. Extend the line in both directions as much as possible.