Which of the following ordered pairs corresponds to an arrow on a mapping diagram that starts at 4 and ends at 1?
map diagram:
input
1
2
3
4
5
output
1
2
3
4
5
the arrow points from 4 under input to 1 under output.
answer choices are:
a. (1, 1)
b. (1, 4)
c. (4, 1)
d. (4, 4)

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: