mathematics with applications in the management, natural, and social sciences twelfth edition
chapter 6: systems of linear equations and matrices
6.1 exercises
23.) according to google trends, popular interest in led lightbulbs has been soaring. while interest in cfls has been dropping. the following equations approximate the google trends rating (on a scale from 0-100) in year x, where x = 10 corresponds to the year 2010. ( data from )
led: -25x + 6y = 20
cfl: 15x + 2y = 322
when did interest in ed lighting surpass cfl lighting? round your answer to the nearest year.