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

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Note the extra fixed-pitch tone corresponding to the horizontal x axis, and the click in the middle corresponding to the vertical y axis. The equivalent visual function plot is shown below on the left, with a screenshot of the auditory graphing calculator dialog, as activated by pressing function key F8 , on the right.