Answer:
   (-13, -4)
Step-by-step explanation:
It is about as easy to try the solutions as it is to find them from scratch. 
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However, we can determine which one it is by adding twice the second equation to the first.
   (-2a +3b) +2(a -4b) = (14) +2(3)
   -5b = 20
   b = -4 . . . . . . matches the first choice
 
        
             
        
        
        
Answer is 34.96$ for the final cost.
        
             
        
        
        
So (7.4*105)-(8.9*103)   (The sum of all departments)-(The sum of the accounting department) 
(7.4*105)-(8.9*103) = (777)-(916.7) =(-139.7), not sure, did you write the problem wrong? If the total of the company is less than what the account dept used, something is off.  
        
             
        
        
        
Answer:
I believe its the second one but i could be wrong
 
        
             
        
        
        
The answer would be A since in that case its a percentage and there can be multiple answers. In the other questions, there is a definitive answer for it.
Hope this helps :)