The points A(2, 1), B(3, 4), C(–1, –2) and D(, ) in order, are the vertices of a parallelogram. Find the coordinates of D.
(-2,-5)
(-1,-4)
(-5,-2)
(-3,-4)
If the points A (6, 1), B (8, 2), C (9, 4) and D (p, 3) are vertices of a parallelogram, taken in order, find the value of p