7a. 7b. In recent years, the percentage of the US population age 18 and over who smoke has decreased at a roughly constant rate, from 24.1% in 1998 to 20.6% in 2008. (Source: Centers for Disease Control and Population). Find the slope of the equation describing this relationship. An objective of Healthy People 2010 (a campaign of the US Department of Human Services) was to reduce the percentage of US adults who smoke to 12% by the year 2010. If this decline in smoking continued at the same rate, did they meet the objective