the equation to solve this type of question is :
( x1 + x2 ) divided by two = x value of coordinate
( y1 + y2 ) divided by 2 = y value of coordinate
together these equation will give you an answer for ( x , y )
in this case we would set it up like this :
x1 + x2 divided by two would look like this :
(x + -1) / 2 = -3
(x+ -1) = -6
x = -5
now solve for y
y1 + y2 divided by two :
(x+6) / 2 = -8
(x+6) = -16
x = -22
so the answer would be ( -5, -22 ) which is answer A
