GIVING BRAINLIST Which set of ordered pair represents a function?

A. { (1,2), (2,3), (3,4), (4,5) }

B.{ (-5, 2), (-6,5), (-7, 9), (-8, 10), (-5, 11) }

C.{ (1,3), (2,4), (5,6), (2,8) }

D.{ (4,9), (5,8), (8,6), (4,7) }

mr. flanders’ class sold 47 doughnuts and   mr. rodriquez’s class sold 38 cartons of milk

step-by-step explanation:

let x be the number of doughnuts sold by mr. flanders’ class and y be the number of cartons sold by mr. rodriquez’s class.

1. together, the classes sold 85 items, then

x+y=85.

2. both classes earn earned $104.49 for their school. if doughnuts were sold for $1.35 each, then x doughnuts costed $1.35x. if cartons of milk were sold for $1.08 each, then y cartons costed $1.08y. hence,

1.35x+1.08y=104.49.

3. solve the system of two equations: