1. Given 2. If parallel lines are cut by a transversal, then corresponding angles are congruent. 3. Definition of congruency. 4. if parallel lines are cut by a transversal, then corresponding angles are congruent. 5. Linear pairs are supplementary. 6. Definition of supplementary. 7. Substitution 8. Definition of supplementary.
Sorry if these are wrong. I haven't done geometry in so long, but most of these are right. You might want to check number 4 and 2.
