In coordinate plane, when x- coordinate remains same and y –coordinate changes according to Point then it is known as vertical line. According to the definition of vertical line, we can say that a line which goes straight up and down and also parallel to the y – axis of Coordinate Plane is known as vertical line. All points lies on line having same x – coordinate. There is no Slope defined for vertical line. The equation of vertical line is given by: Equation of a line is x = t; Where, ‘x’ represents the coordinates of any point on the line and ‘t’ represents the line which crosses x – axis. In coordinate plane, a line whose y- coordinate remains same and x – coordinate changes according to point is known as horizontal. According to the definition of horizontal line, a line which goes straight left and right and also parallel to the x – axis of the coordinate plane is known as horizontal line. All points lies on the line having same y – coordinate. Slope is also defined for the horizontal line; the Slope of a horizontal line is zero. The equation of a horizontal line is given by: Equation of a line is y = u; Where, ‘y’ represents coordinates of any point on the line and ‘u’ represents the line which crosses x – axis. Let’s see how to Graphing horizontal and vertical lines. Let’s see an example of how horizontal and vertical lines are drawn? Plot a graph of each of the following Relations, horizontal and vertical lines: (A) y = -4 (B) x = -4, Solution: (A) First we see the graph of relation y = -4, in this we draw a line which is parallel to the x- axis because it passes through points such as (-5, -4) and (5, -4).
(B) Then we see the graph of relation x = - 4 is a line which is parallel to y- axis because it passes through points such as (-4, -5) and (-4, 5).
This is how to Graphing Horizontal And Vertical Lines.