# Chapter 12 - Section 12.1 - Three-Dimensional Coordinate Systems - 12.1 Exercises: 26

The equation $y=-2$ represents a vertical plane parallel to the xz-plane that is shifted 2 units in the negative y direction.

#### Work Step by Step

The equation sets a value for y that is independent of x or z. If $f(x,z)=y$, then $f(x,z)$ will equal -2 at every point on the xz-plane.

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