Horizontal and Vertical Lines

Horizontal Lines

Horizontal Line

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

Horizontal Lines

Formula for a Horizontal Line

Line Parallel to the x-axis

Horizontal Line Example

Horizontal Line Example

Vertical Lines

Vertical Line Graph

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

Vertical Lines

Vertical Line

Vertical Line Example

Vertical Line Example

Vertical Line Example

Axes Equations

Axes Equations

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

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