Match the reasons with the statements in the proof if the last line of the proof is:

6. ∠3 and ∠5 are supplementary because of the definition of supplementary.

Given:
s | | t

Prove:
3, 5 are supplementary



1. Exterior sides in opposite rays
2. Definition of supplementary
3. Substitution
4. Given
5. If lines are ||, corresponding angles are equal


s||t

∠1 and ∠3 are supplementary

m∠1 + m∠3 = 180°

m∠1 = m∠5

m∠5 + m∠3 = 180°