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

All the points are in the form of $(-4,y,z)$, where $y,z$ are real numbers.
Since $x$ is set to $-4$, the given plane is parallel to the $yz-$ plane and is $4$ units behind the yz-plane. Thus, all the points are in the form of $(-4,y,z)$, where $y,z$ are real numbers.