Answer:
The proposition <em>If Y is the midpoint of XZ, then XY = 1/2 XZ </em>is true.
Step-by-step explanation:
We proceed to present the demonstration of the following proposition:
<em>If Y is the midpoint of XZ, then XY = 1/2 XZ.</em>
1) Y is the midpoint of XZ. Given.
2)
Definition of line segment.
3)
By 1)
4)
3) in 2)
5)
Algebra/Result
Therefore, the proposition <em>If Y is the midpoint of XZ, then XY = 1/2 XZ </em>is true.