Question 964486
The midpoint is the average of the x and the y points.
{{{-4=(-4+X[2])/2}}}
{{{-8=-4+X[2]}}}
{{{X[2]=-4}}}
.
.
{{{5=(8+Y[2])/2}}}
{{{10=8+Y[2]}}}
{{{Y{2]=2}}}
(-4,2)
.
.
.
{{{drawing(300,300,-9,3,-3,9,grid(1),circle(-4,2,0.2),circle(-4,5,0.2),circle(-4,8,0.2),blue(line(-4,8,-4,2)))}}}