Geometry

Question Analysis:
This is a coordinate geometry question involving the properties of diagonals.
The main focus is on using the midpoint formula in reverse.

Key Concept Explanation:
In parallelograms, diagonals bisect each other, so their midpoints must be the same.

Step-by-Step Solution:
Midpoint of WY is (4, 6) → it must also be the midpoint of diagonal XZ.
We are given X = (5, 4), so let Z = (x, y).
Use midpoint formula:
(5 + x)/2 = 4 → 5 + x = 8 → x = 3
(4 + y)/2 = 6 → 4 + y = 12 → y = 8
So Z = (3, 8)<...