Question 957903
There is no slope intercept form.
Lines perpendicular to horizontal lines are vertical lines and have an undefined slope.
They have the form,
{{{x=a}}}
In your case,
{{{x=-5}}}
.
.
.
{{{drawing(300,300,-6,6,-6,6,grid(1),blue(line(-5,-10,-5,10)),circle(-5,-3,0.2),graph(300,300,-6,6,-6,6,3))}}}