The equation of Z - axis , are…………..

Explanation

To find the equations of the Z-axis in three-dimensional geometry, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Z-axis**: The Z-axis is a line in three-dimensional space where the x-coordinate and y-coordinate are both equal to zero. This means that any point on the Z-axis can be represented as (0, 0, z), where z can take any real number value.

2. **Set the x-coordinate to zero**: Since we are on the Z-axis, we set the x-coordinate to zero. This gives us the equation:
\[
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