When a candle is burning, its height decreases over time. Here is a set of numbers associated with this relationship:
After 1 hour of burning, the candle is 33 cm tall.
After 3 hours of burning, the candle is 27 cm tall.
After 5 hours of burning, the candle is 21 cm tall.
After 6 hours of burning, the candle is 18 cm tall.
Which equation represents the relationship between the height of the candle, y, and the number of hours the candle has burned, x?
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