Explanation:
Mid Point Formula = (x1+x2/2; y1+y2/2)
Co ordinate of Point A = (-9,-4)
Co ordinate of Point C = (-1, 6)
Co ordinate of midpoint B = [(-9) + (-1)/2 ; (-4) + 6/2]
= ( -10/2; 2/2)
= (-5, 1)
Therefore, co ordinate of mid point B is (-5,1)
Co ordinate of Point B = (-5,1)
Co ordinate of Mid Point E = (-4,-3)
Co ordinate of point D = (x, y)
-4 = x + (-5)/2 ; -3 = y + 1/2
-4×2 = x - 5; -3×2 = y + 1
-8 + 5 = x ; -6 - 1 = y
-3 = x ; -7 = y
Therefore, co ordinate of Point D is (-3,-7)