Respuesta :

[tex] -\frac{9}{3} [/tex] + b = -1
Simplify [tex] -\frac{9}{3} [/tex], which is: -3
-3 + b = -1
take -3 to the other side
-3 (+3) + b = -1 + (3)
-3 and + 3 cancels out
b = 2

Check:
[tex] -\frac{9}{3} [/tex] + (2) = -1
-3 + 2 = -1
-1 = -1