# What is a Vertical Line

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In a coordinate X-Y plane, there are two main axes which are always fixed. They are the X-axis and the Y-axis. The X-axis is the horizontal line and the Y-axis is the vertical line. In the coordinate plane, any axis parallel to the Y-axis is also known as the vertical line. Given any point on the plane, a vertical line can be drawn passing through the given point. Based on the point, the equation of the vertical line can be calculated.

Example 1: On which line are the points (0, 3) and (0, 5) located?

Given two points: (0, 3) and (0, 5)

Hence for the point (0, 3), the ‘x-coordinate’ = 0 and ‘y-coordinate’ = 3.

Similarly, for the point (0, 5), the x-coordinate = 0 and the y-coordinate = 5.

We can see that both the points have the ‘x’ coordinate as ‘0’ which means that the points are on the Y-axis

as only on Y-axis, all the x-coordinates of the points are ‘0’.

Example 2: On which line are the points (0, -1) and (0, -6) located?

Given two points: (0, -1) and (0, -6)

Hence for the point (0, -1), the ‘x-coordinate’ = 0 and ‘y-coordinate’ = -1

Similarly, for the point (0, -6), the ‘x-coordinate’ = 0 and the ‘y-coordinate’ = -6.

We can see that both the points have the ‘x’ coordinate as ‘0’ and hence the points are located on the Y-axis.

This Y-axis is the vertical line continuing up and down until positive infinity and negative infinity.