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

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