Final answer:
To form pairs that do not represent a function, we look for pairs with the same x-coordinate but different y-coordinates. The correct pairs are b and c, d and e, and a and f.
Step-by-step explanation:
To form pairs that do not represent a function, we need to find pairs with the same first value (x-coordinate) but different second values (y-coordinate). In this case, the pairs that satisfy this condition are:
(1) (-5, 2) and (-5, 1)
(2) (2, 3) and (2, 2)
(3) (6, -5) and (6, 5)
So, the correct pairs are: b and c, d and e, and a and f.