Question 864342
4x+2y=6
/2
we get 2x+y=3

2	x	+		y	=	3	.............1				
	y	=	3	+	-2	x					
	
	y	=	3		-2	x					
-3	x		-7	y	=	1		.....................2			
Substitute y in		(2)									
-3	x		-7	(	3		-2	x	)	=	1
-3	x		-21	+	14	x	=	1			
-3	x		14	x	=	22					
11	x	=	22								
/	11										
x=	2      										
Plug the value of x in (1)											
2	x	+		y	=	3					
2	*	2      	+	1	y	=	3				
4      	+	1	y	=	3						
	y	=	-1      								
/	1										
y=	-1      										
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x+y=13
x-y=2
in the second equation
y=x-2substitute y in (1)

x+(x-2)=13

2x-2=13
2x=15
x=15/2

Plug x in (2)

x-y=2
(15/2)-y=2

y= 15/2 -2

y=11/2