Question 556959
The slopes of perpendicular lines, multiplied, equals -1.
The slope of AB can be calculated as the difference of the y coordinates divided by the difference of the x coordinates.
slope of AB = {{{(4.9-2.9)/(-8.1-(-7.6))}}} = {{{2.0/(-8.1+7.6)}}} = {{{2.0/(-0.5)}}} = {{{2*2.0/(2*(-0.5))}}} = {{{4/(-1)}}} = {{{-4}}}
The slope (m) of the perpendicular line is such that
{{{-4m=-1}}} --> {{{m}}} = {{{-1/(-4)}}} = {{{1/4}}}