The number of reported disruptive airline passengers has increased linearly over the years, rising from 339 cases in 2007 to 8217 cases in 2013. Using these two data points, find a linear function, f(x) = mx + b, that models the data. Let x represent the number of years after 2007. Then use this function to estimate the number of reported cases of disruptive airline passengers in 2011 and in 2017.