Give the geometric representations of 2x+9=0 as an equation (i) in one variable (ii) in two variables

(i) In one variable
Given equation is 2x+9=0 ⇒2x=-9 ⇒x=-9/2=-4.5
Point B(-4.5,0) is representing 2x+9=0
(ii) Given equation is 2x+9=0 ⇒2x+0y+9=0 ⇒0y=-2x-9
It is a line parallel to y-axis at a negative distance (-4.5)
Two points lying on it are the points A(-4.5,0), B(-4.5,2).
In one variable x just represent a point B(-4.5,0) whereas in two variables it represents a line (2x+9=0)