Question 805302
x= 	Plane speed in still air							
y=	wind speed							
 								
1    	x	+	1    	y	=	158    	.............1	
Total value								
1    	x		-1    	y	=	112    	.............2	
Eliminate	y							
multiply (1)by		1    						
Multiply (2) by		1    						
1    	x		    	y	=	158    		
    	x		-    	y	=	112    		
Add the two equations								
2    	x				=	270    		
/	2    							
x	=	135    						
plug value of			x	in (1)				
1    	x	+	1    	y	=	158    		
135    		+		y	=	158    		
				y	=	158    		-135    
				y	=	23    		
				y	=	23    		
x=	135    		Plane speed in still air	135    				
y=	23    		wind speed	23    				
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