Try to plot the following surface using geogebra

plane: 2x + 3y - 2z = 3

cylinder: x^2 + y^2 = 9

sphere: x^2 + y^2 + z^2 = 9

paraboloid: x^2 + y^2 = z

cone: x^2 + y^2 = z^2

ellipsoid: x^2/4 + y^2/9 + z^2/1 = 9