Question

Look at the figure shown below. A student made the table shown below to prove that XY is equal to YZ.
Statements Justifications

1. NY = MY

Given

2. m∡MYX = m∡NYZ

Given

3. m∡XNY = m∡ZMY

Given

4.



5. m∡MYZ = m∡MYX + m∡XYZ

Angle Addition Postulate

6. m∡MYZ = m∡NYZ + m∡XYZ

Substitution

7. m∡NYX = m∡MYZ

Transitive Property

8. triangleXYN ≅ triangleZYM

ASA postulate

9. XY = ZY

CPCTC
A. Provide the missing statement and justification in the proof.

B. Using complete sentences, explain why the proof would not w