Question 1096066
Midpoint for line AB
{{{x=(-1+2)/2=1/2}}}
{{{y=(-2+1)/2=-1/2}}}
point( 1/2, -1/2)


Midpoint for line GH
{{{x=(-3+2)/2=-1/2}}}
{{{y=(3+(-2))/2=1/2}}}
point ( -1/2, 1/2)



Slope of the line containing those two midpoints,  {{{highlight(-1)}}}.