Answer:
The value of b is -5
The value of b in the given equation 
 is -5
 is -5
Step by step Explanation:
The given equation is 

To find the value of b in the given equation :
 

 ( using the property
 ( using the property 

here m=-9 and n=b )
Since the base y are same in both sides so we can equate the powers as below :
-9b=45

b=-5
Therefore the value of b is -5
The value of b in the given equation 
 is -5
 is -5