Answer:Angle A is equal to 113
Step-by-step explanation:
If two angles are vertical, that would make them equal to each other.
7x-20=6x-1
Add on to both sides
7x-19=6x
Subtract Seven from both sides
-19=-x
Divide by negative one to get rid of the negative
19=x
Then plug x into the equation 7(19)-20
