Respuesta :

see the attached picture:

 only one solution (1,5,1)

Ver imagen musiclover10045
Answer is A!

x + 5 + 3(1) = 9
x + 5 + 3 = 9
x + 8 = 9
x = 9 - 8
x = 1

Final answers: x = 1, y = 5, z = 1 or (1, 5, 1)