Whats the mid point of a segment whose edpoints are (3,-1) and (-5,-3)

There are midpoint formulas, one for the x-coordinate of the midpoint and another for the  y-coordinate:

           x1+x2
xm =
               2

and 

          y1+y2
ym =
               2

Note that when you ad y1 and y2 together and divide this sum by 2, you get the average, or midpoint, of the y-distance separating the two points.

Here the two points are (3,-1) and (-5,-3).

The x-coord. of the midpoint is  xm = (3 + [-5])/2, or 8/2, or 4.

The y-coord                           is  ym = (-1+[--3])/2, or -4/2, or -2.

Thus, the midpoint of the line segment joining (3,-1) and (-5,-3) is (4,-2). 

22.