Through:(4,2), parallel to y=x-1

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

Can someone me with the property questions for 12 13 and 14 plz

If two points are given,then exactly one line can be drawn through those two points.which geometry term does the statement represent