Question 572982
9	x	+	-1	y	=	40	.............1	
1	x	+	8	y	=	45	.............2	
Eliminate	y							
multiply (1)by		8						
Multiply (2) by		1						
72	x		-8	y	=	320		
1	x	+	8	y	=	45		
Add the two equations								
73	x				=	365	
/	73							
x	=	5      						
plug value of			x	in (1)				
9	x	+	-1	y	=	40		
45		+	-1	y	=	40		
			-1	y	=	-5
					
				y	=	5      		

(5,5)