Find the coordinates of the missing vertex in the parallelogram. Use parentheses when entering the coordinates. ABCD with vertices A(2, 0), B(−2, 1), and D(4, 2).
To get from B to A we reduce the y coord by 1 and we increase the x coord by 4. So to get from D to C (because AB is parallel to DC) we reduce the y coord of D by 1 and increase the x coord by 4 to give us C(8,1).