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Besides, how is horizontal line drawn?

The horizontal line is drawn by connecting similar swing lows in price to create a horizontal support line. For a horizontal resistance line, similar swing highs are connected. In more simple terms, a horizontal line on any chart is where the y-axis values are equal.

Also, how is the vertical line? A vertical line is one the goes straight up and down, parallel to the y-axis of the coordinate plane. In the figure above, drag either point and note that the line is vertical when they both have the same x-coordinate. A vertical line has no slope. Or put another way, for a vertical line the slope is undefined.

Similarly one may ask, what is an example of a horizontal line?

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.

Is a straight horizontal line a function?

No, horizontal lines are not functions. However, horizontal lines are the graphs of functions, namely of constant functions. For example, the function which accepts any number as input but always returns the number 5 as output has a graph parallel to the x-axis, but 5 units above it.