1,x-y=2 xy=15 (x=5,y=3) 2,x+y=6 x-y=2 (4,2) 3,x+y=11,xy=30 (x=5,y=6,x=6,y=5) 4,x+y=13,xy=42 (x=6,7,y=7,6) 5,x+y=11,x-y=1 (x=6,y=5) 6,x+y=12,xy=35 (x=5,7,y=7,5) 7,x+y=5,xy=6 (x=2,3,y=3,2) 8,x-y=5,xy=36...