Answer :
The equation of the vertical line is x = 4
Here, we want to write the equation of a vertical line passing through the given point
The equatuin of a vertical line is of the form;
[tex]x\text{ = k}[/tex]where k represents the x-axis coordinate value
The x-axis coordinate value here is 4
So the equation of the line is;
[tex]x\text{ = 4}[/tex]