Equation of Line Parallel to Y Axis

The equation of a line parallel to y axis is of the form x = a and it cuts the x-axis at the point (a, 0). This line is parallel to y axis and is at a perpendicular distance of 'a' units from the y-axis. The slope of the equation of line parallel to y axis is undefined, since it is inclined at 90º with the x axis.

Let us learn more about how to find the equation of line parallel to y axis, the properties of this line, and check a few examples.

The equation of line parallel to y axis is of the form x = a, and it cuts the x-axis at the point (a, 0). Here all the points on this line parallel to the y-axis will have the same x coordinate of a. Further the equation of line parallel to y-axis and cutting the x-axis at point (a, 0) is at a perpendicular distance of 'a' units from the y-axis. The distance between two lines which is a line parallel to y-axis and the y-axis is a units. This equation of line parallel to y axis makes an angle of 90º with the x-axis, and hence its slope is equal to the value of Tan90º, which is undefined.

The equation of line parallel to the y axis and cutting the positive x-axis passes through the first and the fourth quadrant. And the equation of line parallel to the y axis and cutting the negative x-axis passes through the second and the third quadrant of the coordinate axes.

As an example, let us consider the equation of line parallel to y-axis, which is x = 3. This equation x = 3 cuts the x-axis on the positive side at the point (3, 0), and it passes through the first and the fourth quadrant. Further, the points (3, 1), (3, 2), (3, 5), (3, -2), (3, -3), (3, -5), all of these points falling on this line x = 3.

The following are the properties of the equation of line parallel to the y-axis

• The line parallel to y-axis cuts the x-axis at one distinct point.
• The line parallel to the y-axis cuts the x-axis at only one point (a, 0) and has the equation x = a.
• The equation of line parallel to y-axis and cutting the x-axis at the point (a, 0) is at a perpendicular distance of 'a' units from the y-axis.
• The x coordinate of all the points lying on the line parallel to the y -axis are all the same value.
• The slope of a line parallel to the y-axis is undefined.
• The line parallel to the y-axis is always perpendicular to the x-axis.
• There can be numerous lines drawn parallel to the y-axis.
• The equation of line parallel to y-axis does not have the y variable.

Related Topics

The following topics are helpful to find the equation of line parallel to y-axis.

• X and Y Coordinates
• Coordinate Geometry
• Slope
• Point Slope Form
• Slope Intercept Form
• Equation of a Line

What Is Equation of Line Parallel to Y Axis?

The equation of line parallel to y axis is of the form x = a, and it cuts the x-axis at the point (a, 0). This equation of a line x = a is a line parallel to y-axis and is at a perpendicular distance of 'a' units from the y-axis. And every point on this line x = a has the value of x coordinate equal to 'a'.

What Is the Equation of Y-Axis?

The equation of y-axis is the line which cuts the x-axis at the origin, (0, 0). Hence the equation of a y-axis is x = 0.

What Is the Slope of the Equation of Line Parallel to Y Axis?

The slope of the equation of line parallel to y axis is undefined. The line parallel to y axis is at an angle of 90º to the x - axis and the slope of this line is tan90º, which is undefined.

What Is Required to Find Equation of Line Parallel to Y Axis?

The minimum required criterion to find the equation of line parallel to y axis is any point on the line. The equation of line parallel to y axis and passing through a point (a, b) is the x = a.

What Is the Formula to Find Equation of a Line Parallel to Y Axis?

The standard form of the equation of line parallel to y axis is x = a, and it cuts the x-axis at the point (a, 0). This can be taken as the formula for equation of a line parallel to y axis.