Question 1104851
A parallel line would be as {{{y=7x+c}}}.

A perpendicular line would be as {{{y=-(1/7)x+d}}}.



For your desired perpendicular through  (-2,3),
{{{y+x/7=d}}}
{{{d=3+(-2)/7}}}
{{{d=3-2/7}}}
{{{d=21/7-2/7}}}
{{{d=19/7}}}
-
{{{highlight(y=-(1/7)x+19/7)}}}