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it is B the candle starts out at a height of 7 in so that would give you a positive y-intercept. because it burns, meaning the height is decreasing, at 2 in. an hour, your slope would be -2x. -- negative because it is decreasing. x means per hour now you combine the two to get 7-2x
the equation that represents the relationship between y and x is b. Hope this helped!!