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# What is a vertical line?

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A vertical line is one that is parallel to the y-axis of a graph. A vertical line is also perpendicular to the x-axis of the same graph, which means that the value of the x-coordinate for a vertical line does not change.

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A vertical line can be verified by checking the x-coordinate of that particular line. Any vertical line has the same value of x-coordinate throughout, which means that any two points on that line will have the same value of x-coordinate. When drawing a vertical line, you should get the value of x-coordinate for the line by putting the value of y as 0 in the equation of the line to get the x-intercept of the line. After getting the value of the x-coordinate, simply mark that point on the x-axis and then draw a straight line perpendicular to the y-axis to this point. Such a line will be parallel to the y-axis of the graph and, therefore, according to the definition of vertical lines, will be a vertical with respect to this graph. A vertical line has no slope, which can easily be proved as the value of x-coordinate of the line is same all along its path.

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## Related Questions

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According to the Math Planet, a coordinate plane is a two-dimensional number line that is composed of a horizontal line called the x-axis and a vertical line called the y-axis. These two lines are perpendicular with each other and intersect at a point called the origin.

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In mathematics, vertical angles are always congruent. Vertical angles are the angles positioned opposite from each other when two lines intersect. They are called vertical because the angles share the same vertex, or corner point, not because they run vertically on a page.

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In the Cartesian Plane, the slope of a graph represents the rate of change of the graph. The slope of graph at any given point is the point's "y" value (rise) divided by the "x" value (run).