Question 1109078
{{{drawing(400,400,-10,10,-10,10,graph(400,400,-10,10,-10,10),
circle(-6,-4,.1), green(line(-6,-20,-6,20)),locate(-6,-4,"(-6,-4)") )}}} 
<pre>
Since that green vertical line goes through -6 on the x-axis 
and is vertical, the coordinate of every point on that line
has its x-coordinate as -6, so the equation is simply 
<font size=5><b>
       x = -6 
</font></b>Edwin</pre>