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# Equation of a Horizontal Line

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

Horizontal Line Picture
Vertical Line Picture

### 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

General Formula for the Equation of a Equation Line

is y = k where k is the y-intercept

### 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 2 of a Vertical Line

Equation: y = 2

Example 3 of a Vertical Line

Equation: y = -1