Question 337634
{{{m1+m2+m3=(y2-y1)/(x2-x1)+(y3-y1)/(x3-x1)+(y3-y2)/(x3-x2)}}}
{{{m1+m2+m3=(-2-6)/(5-2)+(-3-6)/(-3-2)+(-3-(-2))/(-3-5)}}}
{{{m1+m2+m3=(-8)/(3)+(-9)/(-5)+(-1)/(-8)}}}
{{{m1+m2+m3=-8/3+9/5+1/8}}}
{{{m1+m2+m3=-320/120+216/120+15/120}}}
{{{m1+m2+m3=-89/120}}}