Plot the points (5,0), (5,1), (5,8). Do they lie on a line? What is your observation?
Draw XOX' and YOY' the co-ordinates axis on the graph. Take 1 cm = 1 unit
Point A(5,0) B(5,1) and (5,8) have been plotted on the graph. By joining A,B and C, wesee that these points lie on the same line which is 5 units from y-axis.