Respuesta :

11qq11

2. 2 sides in a line

3. linear (or) supplementary

5. Vertically, equal

6.Substitution

7. alternate exterior angles

ricchad

Answer:

see below

Step-by-step 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