Question 1022093
The midpoint is the average of the x and y values.
{{{x[m]=(x[1]+x[2])/2}}}
{{{1=(-3+x[2])/2}}}
{{{2=-3+x[2]}}}
{{{x[2]=5}}}
Similarly for y,
{{{-2=(-8+y[2])/2}}}
{{{-4=-8+y[2]}}}
{{{y[2]=4}}}
(5,4)