Question 875702
correct answers be x
and wrong answers be y

x+y=100

3x-y=176

x= 	number of	correct answers						
y=	number of	wrong answers						
 								
1	x	+	1	y	=	100	.............1	
								
3	x		-1	y	=	176	.............2	
Eliminate	y							
multiply (1)by		1						
Multiply (2) by		1						
1	x		1	y	=	100		
3	x		-1	y	=	176		
Add the two equations								
4	x				=	276		
/	4							
x	=	69      						
plug value of			x	in (1)				
1	x	+	1	y	=	100		
69		+		y	=	100		
				y	=	100		-69
				y	=	31		
				y	=	31		
x=	69		number of	correct answers				
y=	31		number of	wrong answers				
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