Small boxes contain books, and large boxes contain games. Three boxes of games and a box of

books weighs 48 pounds. Three boxes of games and five boxes of books weigh 72 pounds.

Which system of equations can be used to determine b, the mass, in pounds, of one box of books, and g, the mass, in pounds, of one box of games.
Responses
A 3g + b = 48

3g + 5b = 723 g + b = 48 3 g + 5 b = 72
B 3g + b = 48

3g - 5b = 723 g + b = 48 3 g - 5 b = 72
C 3g - b = 48

3g - 5b = 723 g - b = 48 3 g - 5 b = 72
D 3g - b = 48

3g + 5b = 72