Respuesta :

mathmate

Answer:

{ x | 1, 2, 3, 4, 5, 6, 7, 8, 9 }

Step-by-step explanation:

We note that points between integer values have been excluded, so domain consists of integer x-values from 1 to 9, or

{ x | 1, 2, 3, 4, 5, 6, 7, 8, 9 }

and not

1 <= x <= 9