Question 989944
Midpoint is the average of x and y values.
{{{x[m]=(x[r]+x[s])/2}}}
{{{5=(6+x[s])/2}}}
{{{6+x[s]=10}}}
{{{x[s]=4}}}
.
.
{{{y[m]=(y[r]+y[s])/2}}}
{{{3=-2+y[s])/2}}}
{{{-2+y[s]=6}}}
{{{y[s]=8}}}
.
.
S:(4,8)