Answer:
Explanation:
The problem shows a 90° angle split by a ray, we know that both angles are equal to 90° because the whole is equal to the sum of its parts therefore adding 6b+7 and 7b-8 gives us 90° which is simplified as
13b°-1°= 90°
add 1 to both sides
13b°-1° + 1° = 90° +1°
13b° = 91°
divide by 13
13b°/13 = 91°/13
b= 7°