# The Graphs of Horizontal and Vertical Lines – Practice ProblemsHaving fun while studying, practice your skills by solving these exercises!

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A horizontal line is parallel to the x-axis and is perpendicular, as well as intersects, the y-axis. The slope of a horizontal line is always zero, as its change in y is always zero. A vertical line, on the other hand, is parallel to the y-axis and is perpendicular, as well as intersects, the x-axis. The slope of a vertical line is undefined, as its change in x is always zero, thus giving a slope with zero in the denominator. See how Stephanie applies these properties to plot movements for her game character 8-BitBot in navigating vertical and horizontal direction in her computer gaming program. Common Core Reference: CCSS.MATH.CONTENT.8.FA.3

Exercises in this Practice Problem
 Identify the characteristics of horizontal lines. Describe vertical lines. Identify the corresponding equation to the graphed line. Decide if the line is horizontal or vertical. Identify the type of line and their corresponding equations. Calculate the slope of the line given two points and identify what type of line it is.