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Equation of a Horizontal Line

Horizontal lines 'go' perfectly sideways like the red lines pictured below .

Horizontal Line Picture Picture of Horizontal Line Graph
Vertical Line Picture Picture of Vertical Line Graph

Properties of Horizontal Lines

Equation of Horizontal Line always takes the form of y = k where k is the y-intercept of the line. For instance in the graph below, the horizontal line has the equation y = 1 As you can see in the picture below, the line goes perfectly sideways at y = 1.

Example 1 of a Vertical Line

Equation: y = 1

horizontal line example
General Formula for the Equation of a Equation Line

is y = k where k is the y-intercept

General Equation of Horizontal Line

Several Examples

Below are several examples of the equation and graph of different Horizontal lines

Example 1 of a Horizontal Line

Equation: y = 3

Example of graph of a Horizontal line
Example 2 of a Vertical Line

Equation: y = 2

Example of graph of a Horizontal line
Example 3 of a Vertical Line

Equation: y = -1

Example of graph of a Horizontal line
Back to Lines Home Next to Vertical Lines