Question 479610
y=50+0.15(x-500)
y= 50+0.15x-75
y-0.15x=-25 ........1


y=105+0.10(x-650)
y= 105 +0.10x-65
y-0.10x=40............2

Use the elimination method to find x & y

-0.15	x	+	1	y	=	-25	.............1	
-0.1	x	+	1	y	=	40	.............2	
Eliminate y								
multiply (1)by 		-1						
Multiply (2) by		1						
0.15	x		-1	y	=	25		
-0.1	x	+	1	y	=	40		
Add the two equations								
0.05	x				=	65		
/	0.05							
x	=	1300    			
plug value of 			x	in (1)				
-0.15	x	+	1	y	=	-25		
-195		+	1	y	=	-25		
			1	y	=	-25	+	195
			1	y	=	170		
				y	=	170

The solution of system of equations (1300,170)
m.ananth@hotmail.ca