Question 31282
y=1/(x-1), x=-2, y=1/(-2-1) which y=1/-3 (-0.333..)
           x=-1, y=1/(-1-1) which y=1/-2 (-0.5)
           x=0,  y=1/(0-1)  which y=1/-1 (-1)
           x=1,  y=1/(1-1)  which y=1/0  (undefined)
           x=2,  y=1/(2-1)  which y=1/1  (1)
           x=3,  y=1/(3-1)  which y=1/2  (0.5)