Question 433802
A (-1,10)
b (6,8)
c (3,-2)
d(-4,0)

we need to prove ab is parallel to cd
                  ad is parallel to bc

m1(ab)=(8-10)/(6--1)=-2/7
m2(cd)=(0--2)/(-4-3)=2/-7=-2/7
m3(ad)=(0-10)/(-4--1)=-10/-3=10/3
m4(bc)=(-2-8)/(3-6)=-10/-3=10/3

Hence  it is a parallelogram  ANS