Respuesta :

-40 = -b
40 = b

b = 40

Answer:

b = 40

Step-by-step explanation:

-b/4 = - 10              Multiply both sides by 4

-b/4 * 4 = - 10 * 4

- b = - 40               Multiply both sides by -1

(-1) * (-b) = (-40)(-1)

b = 40