What is the slope of the line parallel to the line -2x+y=-7

What is the average rate of change for this function for the interval from x=2 to x=4 ?

If f(x) =3x-2 and g(x) =2x+1 fins (f+ g) (x)

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.