Please help me Line m is graphed on the coordinate grid shown. (0,-4) (-4,8) What is the slope of a line perpendicular to Line m?​

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.