Look at the following pairs of numbers (x, y).
(3, 16.5), (4, 22), (5, 27.5), (6, 33)
Which could be the relationship between x and y?
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A. y = 4.5 x
O
B. y = 5.5 x
O
C. y = 6.5 x
O
D. y = 7.5 x