Question 424759
x+y=4
x=0 y=4 (0,4)
y=0 x=4 (4,0)
x-y= 2
x=0,y=-2 (0,-2)
y=0x=2 (2,0)

{{{drawing(300,300,-10,10,-10,10,circle(0,4,0.3),circle(4,0,0.3),circle(0,-2,0.3),circle(2,0,0.3),circle(3,1,0.3),graph(300,300,-10,10,-10,10,y=4-x,y=x-2))}}}
The solution is (3,1)