SageMath syntax for Section 2.6

SageMath is a free open-source mathematics software system. You can use a SageMath cell online by going here.

Equations in space are simplest to graph using the implicit_plot3d function. Here is an example for a paraboloid.

​x
var("x,y,z")
implicit_plot3d( x^2+y^2==z, (x,-2,2), (y,-2,2), (z,0,1) )