2 answers:
            
              
              
                
                
X = 12
-3x = -15
+3 +3
—————
 x = 12
negative and a positive = subtract
When the signs are the same add
                                
             
                    
              
              
                
                
Answer:
x=5
Step-by-step explanation:
so to isolate the x you dived the -3 to both sides 
so it will now be 
x=5 because a negative times or divided by a negative equals a positive so to prove that x=5 
-3(5)=-15 
which is true 
 
                                
             
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Answer:
yes
Step-by-step explanation:
your answers are correct! congrats!
 
        
             
        
        
        
Answer:
(6,8)
Step-by-step explanation:
midpoint=(x1+x2)÷2,(y1+y2)÷2
a(4,15) b(8,1)
x=4+8=12÷2=6
y=15+1=16÷2=8
Answer=(6,8)
 
        
             
        
        
        
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