Mehmet T. answered • 09/11/19

Tutor for Math, Physics, and Turkish

For the unknown point D there are 3 possibilities, but because it is called ABCD I assume it is between A and C. So

|DC| // |AB| which means,

d_{x} - c_{x} = a_{x} - b_{x}

d_{x}-(-6) = -3-(-1) = -2

d_{x} = -8

and

d_{y} - c_{y} = a_{y} - b_{y}

d_{y} - 2 = -4-(-3) = -1

d_{y} = 1

So D is (-8, 1)