Hello I am trying to solve a problem that involves "the plane y=z". How exactly should I think of this plane? It's obviously one of three planes that can be formed between the three diffirent axes, but which one? What is the intuition behind "y=z"? A really basic question to some of you, I bet. Any help would be appreciated. The understanding behind it all is what I really want to achieve (not just the right answer). Thanks!