Internet Audience At the end of a certain year, the four companies with the largest number of home Internet users in the United States were Microsoft, Time Warner, Yahoo, and Google, with a combined audience of $284$ million users. Taking x to be the Microsoft audience in millions, y the Time Warner audience in millions, z the Yahoo audience in millions, and u the Google audience in millions, it was observed that

z $$ u $=3($x $$ y$)+18$

x $+$ y $=44+$ z $+$ u

and x $$ y $+$ z $$ u $=42.$

How large was the audience of each of the four companies at the end of that year?