Question 1030579
4    	x	+	-5    	y	=	40    	.............1					
-5    	y	=	40    	+	-4    	x						
/	-5    	=										
	y	=	-8    	+	 4/5	x						
2    	x	+	10    	y	=	20    		.....................2				
Substitute y in		(2)										
2    	x	+	10    	(	-8    	+	 4/5	x	)	=	20    	
2    	x	+	-80    	+	8    	x	=	20    				
2    	x		8    	x	=	100    						
10    	x	=	100    									
/	10    											
x=	10    											
Plug the value of x in (1)												
4    	x	+	-5    	y	=	40    						
4    	*	10    	+	-5    	y	=	40    					
40    	+	-5    	y	=	40    							
-5    	y	=	0    									
/	-5    											
y=	0    											
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