Revolution About the x-Axis Use the shell method to find the volumes of the solids generated by volving the regions bounded by the curves and lines in Exercis 15-22 about the x-axis. 15. x = y, x = -y, y =2 16. x = v2 x = y, y = 2, 120 17. x = 2y - y , x = 0 18. x = 2y - v- X = y