SOLUTION: Solve the System By Substitution - x - y - z = - 8 -4x + 4y + 5z = 7 2x + 2z = 4 A step-by-step explanation would be greatly appreciated. Thank you :)

Question 1101285: Solve the System By Substitution
- x - y - z = - 8
-4x + 4y + 5z = 7
2x + 2z = 4
A step-by-step explanation would be greatly appreciated. Thank you :)
Answer by Edwin McCravy(20056) (Show Source): You can put this solution on YOUR website!




Solve  for x
      
      

Substitute 2-z for x in 
                        
                         
                          
                        
                        

Substitute 2-z for x and 6 for y in the only equation
we haven't used, which is  
                           
                           
                           
                           
                           

Finally find x by substituting -1 for z in 
                                            
                                           
                                            

          (x,y,z) = (3,6,-1)

Edwin

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