Very quick, basic question about Graphing

[rygza]

so I'm graphing tetrahedron bounded by a given plane and "The coordinate planes"

what is meant by "the coordinate planes"? i can graph the plane but i need help here

 

[ArcanaNoir]

The xy plane, the xz plane, and the yz plane. (in r3). Like saying "bounded by the x and y axis" in r2.

 

[rygza]

ah ok, thank you!