Answer:

Explanation:
Isolate the b from one side of the equation.
First, subtract by 5 from both sides.

Solve.
Subtract.
9-5=4
2b=4
Divide by 2 from both sides.
2b/2=4/2
Solve.
Divide the numbers from left to right.
4/2=2

Therefore, the correct answer is b=2.
I hope this helps, let me know if you have any questions.