Find the value of x, will mark brainliest

Which property is illustrated by the statement given below? raj raj.

What is the missing step in this proof ?

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?