Question 445381
6x+3y+z	=19--------------1
x-3y+2z=21--------------2
17x-2y+	2z=86-----------3
																
consider equation 1 &2	Eliminate y
Add the two 																
7x+3z=40-------------4	
consider equation 2 & 3	Eliminate y		
7x+3z=40--------------5
Multiply 2 by -2							
Multiply 3 by 3												
we get 																
-2x+6y-4z=-42							
51x-6y+	6z=258							
Add the two 																
49x+2z=216	-------------5				5		
Consider (4) & (5)	Eliminate z													
Multiply 4 by	-7												
Multiply (5) by	1												
we get												
-49x-21z=-280										
49x+2z=216										
Add the two 																
-19z=-64										
/-19															
z=3.37									
Plug the value of z in	5										
49x+6.74=216										
49x=209.26									
x=4.27	
plug value of x & z in					1		
25.62+3y+3.37=19
3y=-25.62-3.37+	19
y=-9.99					
											
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