Answer:
Step-by-step explanation:
let coordinates of D are (x,y)
mid point of AC=midpoint of BD
so{ (-3+4)/2,(1+6)/2}={(x+(-1))/2,(y+4)/2}
(1/2,7/2)={(x-1)/2,(y+4)/2}
(x-1)/2=1/2
x-1=1
x=1+1=2
(y+4)/2=7/2
y+4=7
y=7-4=3
so D is (2,3)
