Inéed to know wich of thé staments are true

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?

Can someone me out here and the tell me the greatest common factor

Im literally having a mental breakdown