Respuesta :

Answer:

9) x = 4   D)

10) x = 7    B)

Step-by-step explanation:

9)

Vertical angles are congruent.

23x - 2 = 90

23x = 92

x = 4

10)

Vertical angles are congruent.

18x - 6 = 1 + 17x

x = 7