Geometry

Question Analysis：
This question combines algebra with a geometric property of parallelograms.
The main focus is on using the fact that opposite sides are equal.

Key Concept Explanation：
In any parallelogram:
Opposite sides are congruent, so WX = YZ
We can solve for x using an equation

Step-by-Step Solution：
WX = 3x – 7
YZ = x + 9
Set them equal: 3x – 7 = x + 9
Subtract x from both sides: 2x – 7 = 9
Add 7: 2x = 16
Divide by 2: x = 8

Common Mistakes：...