Question 475268
3x+5y-z	=11			--------------				1
2x+y-3z	=12			--------------				2
y+2z=-4	--------------				3
																
consider equation 1 &2				Eliminate y												
Multiply 1 by	1									
Multiply 2 by	-4									
we get																
3x+5y-z	=	11						
-8x+y+12z=	-48						
Add the two 																
-5x+6y+11z=	-37	-------------				4	
consider equation 2 & 3				Eliminate y												
Multiply 2 by 				-1												
Multiply 3 by				1												
we get 																
-2	x	+	-1	y	+	3	z	=	-12							
0	x	+	1	y	+	2	z	=	-4							
Add the two 																
-2x+5z=	-16	-------------5			
Consider (4) & (5)Eliminate x													
Multiply 4 by				2												
Multiply (5) by				-5												
we get				2												
-10	x	+	22	z	=	-74										
10	x	+	-25	z	=	80										
Add the two 																
-3	z	=	6										
/	-3															
z	=	-2	
Plug the value of z in						5	
-2	x	+	-10		=	-16	
-2	x	=	-6				
x	=	3	     			
plug value of x & z in					1		
9	+	5	y	+	2	=	11
5	y	=	-9	+	-2	+	11
	y=	0	   			
      					
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