ABCD it's an isosceles trapazoid With A(10,-1),B(8,3), and C(-1,3).find the coordinates of D

Answer 1

we want AD parallel to BC, so D will have to be (x,-1).

Since (10,-1) is 2 units to the right of B, D will have to be 2 units to the left of C: (-3,-1)

Answer 2

(-3,-1)