Parallelogram ABCD has A(0,1), B(2,1) and C(4,0) as three of its vertices. What is the sum of the coordinates of point D?
Note that A is 2 units to the left of B
So.....D is 2 units to the left of C = ( 4 - 2, 0 ) = (2, 0)
So.....the sum of its coordinates = 2
Thanks so much, CPhill! Very good, yay!