Respuesta :

Answer:

3

Step-by-step explanation:

-1 = b - 4

-1 + 4 = b - 4 (+4)

3 = b

Answer:

3

Step-by-step explanation:

-1 = b - 4

add 4 to both sides

-1 + 4 = b - 4 + 4

simplify

3 = b