Give detailed explanation

3. Set up, but do not evaluate, the volume of the solids generated by rotating the regions bounded by y = vx -1+1, y =8 - x and y = 1 about the following lines using both the washer / disc and cylindrical shell methods. Provide a sketch of the region, a washer / disc or a cylinder for each case and indicate the dimensions needed for the set up. Simplify the integrands. (a) The y-axis. (b) x=-1