Idk what linear combination is but you can solve this way: 
3x+y=4
-2x-y=-5
x=-1
3(-1)+y=4
-3+y=4
y=7
So x=-1 and y=7
        
                    
             
        
        
        
Answer:
110 beats per minute.
Step-by-step explanation:
Since we know it beats 6600 beats per hour and there are 60 minutes in an hour then we have to divide 6600 by 60 which is 110.
 
        
                    
             
        
        
        
Answer:
-1/12
Step-by-step explanation:
i took the test
 
        
                    
             
        
        
        
Answer:The answer to this question would be "1470"To find the volume, all you need to do is Multiply the length, width, and height of the object together and you can find the Volume.Hope this helps, Please mark as Brainliest.
Step-by-step explanation:have a good day.
 
        
                    
             
        
        
        
Answer:
the third one
Step-by-step explanation: