Respuesta :

 (-4y-x)-(3y-9)
= -4y -x - 3y + 9
= -7y - x + 9

hope it helps

Answer:    -7y + 8x

Step-by-step explanation:

(-4y - x) - (3y - 9x)

-4y - x - 3y + 9x

-4y - 3y - x + 9x

-7y + 8x