Question 583530
1	x	+	1	y	=	8	.............1	
-1	x		-1	y	=	8	.............2	


equation I								
when x=	0	y=	8	,(	0	,	8	)
when y =	0	x=	8	,(	8	,	0	)
Equation 2								
when x=	0	y=	-8	(	0	,	-8	)
when y =	0	x=	8	(	0	,	8	)

{{{drawing(300,300,-10,10,-10,10,circle(0,8,0.3),circle(8,0,0.3),circle(0,-8,0.3),circle(0,-8,0.3),circle(8,0,0.3),grid(1),graph(300,300,-10,10,-10,10,y=-x+8,y=x-8))}}}


The solution is (8,0)