# Horizontal and Vertical Lines

## Horizontal Lines

Horizontal lines are parallel to the x-axis.

A line parallel to the x-axis that passes through the y-intercept, b, is expressed by the equation: y = b

## Vertical Lines

Vertical lines are parallel to the y-axis.

A line parallel to the y-axis that passes through the x-intercept, a, is expressed by the equation: x = a

### Axes Equations

The equation of the **x-axis** is **y = 0**.

The equation of the **y-axis** is **x = 0**.

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