Question 437699
15x-10y=1.............1				
15y=2+5x	---------2				
/15										
y=0.13+	0.33x					
Plug the value of y in (1)											
15x-10(0.13+0.33x)=1
15x-1.33-3.33x=1			
15x-3.33x=1+1.33				
11.67x=2.33								
/11.67										
x=0.2										
Plug the value of x in (1)											
15x-10y	=1					
15*0.2-10y=1				
3-10y=1						
-10y=-2								
/-10										
y=0.2										
.......................

8x+5y=14	.............1				
9y=52-x	---------2				
/9										
y=5.78-0.11x					
Plug the value of y in (1)											
8x+5(5.78-0.11x)=14
8x+28.89-0.56x=14			
8x-0.56x=14-28.89				
7.44x=-14.89								
/7.44										
x=-2										
Plug the value of x in (1)											
8x+5y=14					
8*-2+5y=14				
-16+5y=14						
5y=30								
/5										
y=6										
..................................

x+y=4	.............1	
-x+y	=4	.............2	
Eliminate y								
multiply (1)by 	-1						
Multiply (2) by	1						
-x-y=-4		
-x+y=4		
Add the two equations								
-2x				=	0				
x=0	
plug value of 			x	in (1)				
x+y=4		
y=4		
equation1			
when x=	0	y=4(0,4)
when y =0,x=4(4,0)
Equation 2								
when x=	0,y=4(0,4)
when y =0x=-4(-4,0)
...
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................

8	x	+	-1	y	=	47	.............1	
1	x	+	1	y	=	16	.............2	
Eliminate y								
multiply (1)by 		1						
Multiply (2) by		1						
8	x		-1	y	=	47		
1	x		1	y	=	16		
Add the two equations								
9	x				=	63		
/	9							
x	=	7    						
plug value of 			x	in (1)				
8	x	+	-1	y	=	47		
56		+	-1	y	=	47		
			-1	y	=	47		-56
			-1	y	=	-9		
				y	=	9