# Write down the equation of x-axis.

**Solution:**

The x-axis and the y-axis are two lines that create a coordinate plane.

The horizontal axis in a coordinate plane is represented by the x-axis.

The points on the x-axis are of the form (a, 0), where a is any real number.

So, the y-coordinate of the point of the x-axis is 0.

The x-axis is represented by the equation y = 0

Therefore, the equation of the x-axis is y = 0.

## Write down the equation of x-axis.

**Summary:**

The equation of x-axis is y = 0.

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