Shell method

Use the SHELL method to find the volume of the solid generated by revolving the region bounded by the given curves about the given lines. 7) (a) y = 4x, y =0, x=2; revolve about the line x = -2 (b) The region in the first quadrant bounded above by the line y = 3x, below by x-axis, and on the right by the line x = 1, about the line y = -1