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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.

## Keep Learning

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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To find the mean, range and mode on a bar graph, analyze both the x- and y-axis. The mode on a bar graph is the value that has the highest bar while the range refers to the difference between the highest and lowest value on the x-axis. The mean can be calculated by multiplying each x-value by its quantity, summing all the results and dividing by the total quantity.

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The National Center for Education Statistics states that on a bar graph where the bars are placed vertically, the y-axis runs vertically from the bottom to the top of the graph. On bar graphs where the bars run horizontally, the y-axis is placed horizontally from left to right.

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Determining the parametric equation of a line requires you to know at least two points on the line. This calculus-based equation can be used to prove that another given point is on that same line. This theorem states that with two given points (x1, y1) and (x2, y2), a third point (x, y) is on the line with these two points only if there is a real number "t" that satisfies the following equations: x = (1-t)x1 + tx2 and y = (1-t)y1 + ty2.