Equation of a Horizontal Line

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