Which ordered pair could be removed so that the set of ordered pairs is a function?
a. (4, –2)
b. (–3, 2)
c. (3, 4)
d. (1, 1)

↑Y
5│
4│
3│
2│
1│
←l━━l━━l━━l━━l━━ │━━l━━l━━l━━I━━l━━>> X
-5 -4 -3 -2 -1 │-1 1 2 3 4 5 6
│-2
│-3
│-4
↓-5