Given:
Angles A and B are vertical angles.
The measure of angle A is 8x + 1 and angle B is 21 – 2x.
To find:
The measure of each angle.
Solution:
We know that vertically opposite angles are always equal.
Angles A and B are vertical angles.


Isolate variable terms.


Divide both sides by 10.


Now,




And,




Therefore, the measure of angle A and angle B is 17 degrees.