Question

-21 = 4b + 19 -(-6b)

Answer 1

Answer:

b = -4

Step-by-step explanation:

-21 = 4b + 19 -  ( -6b)

Switch sides.

4b + 19 - (-6b) = -21

Apply rule - (-a) = a

4b + 19 + 6b = -21

Group like terms.

10b + 19 = -21

Subtract 19 from both sides.

10b + 19 - 19 = -21 -19

Simplify.

10b = -40

Divide both sides by 10.

$\frac{10b}{10} =\frac{-40}{10}$

Simplify.

b = -4