Question 1178342
{{{3y-x=3}}}
{{{3y=x+3}}}
{{{y=x/3+1}}}
Perpendicular to this line, slope would be  {{{-3}}}.



That perpendicular line through point (3,-1):
{{{y=(-3)x+b}}}
{{{b=y+3x}}}
{{{b=-1+3*3}}}
{{{b=8}}}
-
This line, {{{y=-3x+8}}}