Help pls I need this right now

How do i do this activity, is appreciated

Players on the school soccer team are selling candles to raise money for an upcoming trip. each player has 24 candles to sell. if a player sells 4 candles a profit of$30 is made. if he sells 12 candles a profit of $70 is made. determine an equation to model his situation?

I’m really confused and need your assist me with this question i’ve never been taught