Use the shell method to set up and evaluate the integral that gives the volume of the solid generated by revolving the plane region about the x-axis.

x + y^2 = 16

I'm not sure what to set h(y) equal to. Is it sqrt(16-x)? It can't be that because I need to have a y instead of an x, right? I understand how to find the volume and integrate from here.

Thank you.