## Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)

All the points are in the form of $(x,y,2)$, where $x,y$ are any real numbers.
Since $z$ is set to $2$, the given plane is parallel to the $xy-$ plane and moved $2$ units above it. Thus, all the points are in the form of $(x,y,2)$, where $x,y$ are any real numbers.