Which of the following tables represents a function?

a. x) 6 6 7 7
y) 2 −2 3 −3

b. x) 2 −2 3 −3
y) 5 5 7 7

c. x) 3 −3 3 −3
y) 6 7 8 9

d. x) 4 4 5 5
y) 1 2 3 4

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