It has been said that newspapers are​ disappearing, replaced by various electronic media. In 2003​, newspaper circulation​ (the number of copies distributed in a​ day) in a country was about 55 million. In 2013​, this had dropped to 40 million. Assume that the relationship between​ time, x, and​ circulation, y, is a linear relationship. a. Write an equation describing the relationship between time and circulation. Use ordered pairs of the form​ (years past 2003​, number of newspapers circulated in​ millions).
b. Use this equation to predict newspaper circulation in 2020.