Question 552848
5	x	+	35	y	=	-10	.............1		
15	x	+	5	y	=	170	.............2		
Eliminate y									
multiply (1)by 		1							
Multiply (2) by		-7							
5	x		35	y	=	-10			
-105	x		-35	y	=	-1190			
Add the two equations									
-100	x				=	-1200			
/	-100								
x	=	12				
plug value of 			x	in (1)					
5	x	+	35	y	=	-10			
60		+	35	y	=	-10			
			35	y	=	-10-60	
			35	y	=	-70			
				y	=	-2