Question 902030
2      	x	+	9      	y	+	-1      	z	=	0      
3      	x	+	-1      	y		4      	z	=	1      
4      	x	+	8      	y	+	3      	z	=	1      
									
consider equation 1 &2				Eliminate	y				
Multiply 1 by		1      							
Multiply 2 by		9      							
we get									
2      	x		+	9      	y	+	-1      	z	=
27      	x		+	-9      	y	+	36      	z	=
Add the two									
29      	x		+	0      	y	+	35      	z	=
consider equation 2 & 3				Eliminate	y				
Multiply 2 by				8      					
Multiply 3 by				1      					
we get									
24      	x	+	-8      	y	+	32      	z	=	8      
4      	x	+	8      	y	+	3      	z	=	1      
Add the two									
28      	x	+	0      	y	+	35      	z	=	9      
Consider (4) & (5)			Eliminate	x					
Multiply 4 by				-28      					
Multiply (5) by				29      					
we get									
-812      	x	+	-980      	z	=	-252      			
812      	x	+	1015      	z	=	261      			
Add the two									
0      	x	+	35      	z	=	9      			
/	35      								
z	=	  9/35							
28      	x	+	35      	z=	9      				
28      	x	+	9      	=	9      				
			x	=	0      				
Plug x & z in eq (1)									
2      	x	+	9      	y	+	-1      	z	=	0      
	0      	+	9      	y	+	-  9/35		=	0      
			9      	y				=	  9/35
				y	=				  1/35
	x=	0      	y=	  1/35	z=	  9/35