Which ordered pairs are solutions to the equation 5x+15y=12? (select all that apply)

(6,3)
(-5,37/15)
(-7,47/15)
(5,-37/15)
none of the above

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.