The US Department of Health conducted a survey for the years 1985-2018 regarding the use of cigarettes. Data from those years indicate that the linear function  y = −0.47x + 47.1  gives an estimate of the 18-25 age group using cigarettes. The variable x represents the number of years since 1985 and y represents the percentage of 18-25 year old individuals using cigarettes.  Explain what the −0.47 represents in terms of time and the percentage of 18-25 year old individuals using cigarette

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