Short answer questions, pls help

Question

ABCD is a parallelogram with A and C diagonally opposite. The coordinates of A,B and C are (-3,-3),(1.-5) adn (9,1) respectively. The sum of the coordinates of point D is:

Answer 1

Draw and label a diagram

Since the figure is a parallelogram, the slope of AD  must be the same as the slope of BC.

The slope of BC = 6/8

D = (5, 3)