Which table of values does not represent a linear function

Dean and karlene get paid to write songs. dean is paid a one-time fee of $20 plus $80 per day. karlene is paid a one-time fee of $25 plus $100 per day. write an expression to represent how much a producer will pay to hire both to work the same number of days on a song.

Which of the following equations is equivalent to x/3-6/x=1

How is this equation completed? i cannot find any examples in the book.