Answer:
there are 12 dogs.
Step-by-step explanation:
d= dogs              now plug in the 4 into your equation. 
c= cats                  d=3(4)
d+c=16                   d=12 
3c+c=16
4c=16                        SO THEREFORE THERE ARE 12 DOGS :)
c=4            
 
        
             
        
        
        
Answer:
x = 8/5
Step-by-step explanation:
first multiply both side by -1, it makes both side positive
1x/2 = 4/5
now multiply both sides by 2 to get the x by itself
x = 8/5
if they want improper fraction x = 1
 
        
                    
             
        
        
        
(11,3) Becuase when you plug it in, 11,3 satisfies the equation.