Question 805518
x= 	Number of	hours carpenter worked						
y=	Number of	hours apprentice worked						
 								
1    	x	+	1    	y	=	10    	.............1	
Total value								
42    	x	+	24    	y	=	325 1/2	.............2	
Eliminate	y							
multiply (1)by		-24    						
Multiply (2) by		1    						
-24    	x		-24    	y	=	-240    		
42    	x	+	24    	y	=	325 1/2		
Add the two equations								
18    	x				=	85 1/2		
/	18    							
x	=	4 3/4						
plug value of			x	in (1)				
1    	x	+	1    	y	=	10    		
4 3/4		+		y	=	10    		
				y	=	10    		-4 3/4
				y	=	5 1/4		
				y	=	5 1/4		
x=	4 3/4		Number of	hours carpenter worked				

4.75 hours	
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