（1）(5,0) x=-5 (2)(0,1/8) y=-1/8 (3) (5/8,0) x=-5/8 (4) (0,-2) y=2
1:(5,0) x=-5 ;2:(0,1/8) y=-1/8 ;3: (5/8,0) x=-5/8 ;4 :(0,-2) y=2 .
