how do I draw in 3D a parabolic cylinder $\displaystyle y^2 = 8x$ in the first octant bounded by the planes y = 4 and z = 6? Also, what is the name of the topic that has these things such as hyperbolic paraboloids, and other 3d forms, etc I dont know how to look for it.. Also how do I convert this into an explicitly defined function(e.g. Z = f(x,y) ) so that I can graph this on my math software (MathGV).