Step-by-step explanation:
2. Definition of congruence
4. Substitution (you substitute VW for TU and WY for UW because they are equal lengths are shown in step 2)
5. Segment addition postulate (VW + WY is the line VY)
6. Transitive property
7. TW ≅ VY (last step should always be what you're trying to prove)
