Question 519244
cans of pop for $0.50  ------------x items
bags of popcorn for $0.75.---------y  items

x+y=200...................1

0.5x+0.75y=130
multiply 100
50x+75y=13000.............2

Eliminate y								
multiply (1)by 		-75						
Multiply (2) by		1						
-75	x		-75	y	=	-15000		
50	x		75	y	=	13000		
Add the two equations								
-25	x				=	-2000		
/	-25							
x	=	80      			
plug value of 			x	in (1)				
1	x	+	1	y	=	200		
80		+	1	y	=	200		
			1	y	=	200		-80
			1	y	=	120		
				y	=	120

m.ananth@hotmail.ca