Question

B is the midpoint of ACand E is the midpoint of BD. If A(-9, -4), C(-1, 6), and E(-4, -3), find the coordinates of D.

Answer 1

B = (-9 + (-1) /2) (-4 + 6 /2)
B = (-9-1/2) (2/2)
B = (-10/2) (1)
B = (-5) (1)
B = (-5,1)

E = (x1 + x2 / 2) (y1 + y2 / 2)
E = (-5 + x2/2) (1 + y2 / 2)
(-4, -3) = (-5 -3/2) (1 -7/2)
(-4, -3) = (-8/2) (-6/2)
(-4, -3) = (-4) (-3)
(-4, -3) = (-4, -3)

D (-3, -7)