Answer:
Step-by-step explanation:
yes ,great job lxwxh
 
        
             
        
        
        
Answer:

Step-by-step explanation:
The equation is , 
 
 
- Here e is the Euler's Number . The log which are defined on the base e are called Natural logarithms. 
Say if we have a expoteintial equation , 
 
 
In logarithmic form it is , 

Similarly our required answer will be , 

 
        
             
        
        
        
Answer:
Step-by-step explanation:
90x - 60y = 68.....multiply by -1
90x - 70y = 91
---------------------------
-90x + 60y = -68 (result of multiplying by -1)
90x - 70y = 91
---------------------------add
-10y = 23
y = -23/10 <===
90x - 60y = 68
90x - 60(-23/10) = 68
90x + 138 = 68
90x = 68 - 138
90x = - 70
x = -70/90
x = -7/9 <=====