2. 2 sides in a line
3. linear (or) supplementary
5. Vertically, equal
6.Substitution
7. alternate exterior angles
Answer:
see below
Explanation:
1. given
2. adjacent sides in straight line
3. definition of supplementary adjacent angles
4. substitution
5. opposite angles are equal
6. substitution
7. definition of alternate exterior angles
6.6m questions
8.7m answers