The formula for determining midpoint is expressed as
Midpoint = (x1 + x2)/2 , (y1 + y2)/2
For the first question,
x1 = - 1, y1 = - 6
x2 = - 6, y2 = 5
Midpoint = (- 1 + - 6)/2 , (- 6 + 5)/2
Midpoint = (- 1 - 6)/2 , (- 1)/2
Midpoint = - 7/2, - 1/2
For the second question,
x1 = - 3.1, y1 = - 2.8
x2 = - 4.92, y2 = 3.3
Midpoint = (- 3.1 + - 4.92)/2 , (- 2.8 + 3.3)/2
Midpoint = (- 3.1 - 4.92)/2 , (0.5)/2
Midpoint = - 8.02/2 , 0.25
Midpoint = - 4.01, 0.25