Answer:
b = 40
Explanation:
The first step you have to do is multiply 4 on each side to cancel out the 4 under -b, so you can get b by itself.
4 x -10 = -b x 4 should get this -40 = -b
4
Now the final step is to divide -1 on each side to cancel out the negative by b, thus getting b by itself. Then once that is done you will see that your answer is b=40.
-40 = -b should get this 40=b or b=40
-1 -1
Hope this helped!