Question 1045544
Midpoint Pt(x,y):  ( {{{(x[1] + x[2])/2}}}, {{{(y[1] + y[2])/2  )}}})
(5 1) and 
(-3 -1) halfway is (5+(-3))/2 and (1+ (-1))/2  Or C(1,0) 

(5,1)
(1,0) halfway to center  is(5+1)/2 and (1+0)/2  Or P(3,.5)

-3,-1) is 
(1,0) halfway to center is (-3+1)/2 and (-1 + 0)/2  Or P(-1,-.5)

{{{drawing(300,300,   -6, 6, -6, 6, grid(1), 
circle(1, 0,0.3),
circle(3, .5, 0.3),
circle(-1,-.5, 0.3),
blue(line(5,1,-3,-1)) ,
circle(5,1,0.3),
circle(-3,-1,0.3),
graph( 300, 300, -6, 6, -6,0  ))}}}