Respuesta :

Answer:

-x+15 :)

Step-by-step explanation:

Answer:

Step-by-step explanation:

1.

6x+9+7x+6

13x+15

You know to combind them becuase they are like temrs (6x and 7x) (9 and 6)

2.

y=2x-9+x

simplyfied to y=3x-9

3.

Im not sure