Question 816029
x= 	Number of	gallons regular						
y=	Number of	gallons premium						
 								
1.00	x	+	1.00	y	=	280.00	.............1	
Total value								
2.05	x	+	2.75	y	=	637.00	.............2	
Eliminate	y							
multiply (1)by		-2.75						
Multiply (2) by		1.00						
-2.75	x		-2.75	y	=	-770.00		
2.05	x	+	2.75	y	=	637.00		
Add the two equations								
-0.70	x				=	-133.00		
/	-0.70							
x	=	190.00						
plug value of			x	in (1)				
1.00	x	+	1.00	y	=	280.00		
190.00		+		y	=	280.00		
				y	=	280.00		-190.00
				y	=	90.00		
				x=	190.00		Number of	gallons regular				
y=	90.00		Number of	gallons premium				
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