Which of these systems has (0,0)(0, 0)(0,0) as a solution?
x+y=0x+y=0x+y=0 and 2x−y=02x-y=02x−y=0
x+y=1x+y=1x+y=1 and x−y=1x-y=1x−y=1
x=1x=1x=1 and y=0y=0y=0
2x+2y=22x+2y=22x+2y=2 and x+y=1x+y=1x+y=1