How can I find the volume of the solid bounded by the cylinder $y^2+z^2=9$ and the planes $x=2y$, $x=0$, $z=0$ in the first octant?
I'm not really sure how I should even approach this, but I know I should somehow solve it using a double integral. I know how to solve double integrals, but I need help setting up a definite double integral for this problem.