Identifying a Graph of a Proportional Relationship Which graph represents a proportional relationship?
On a coordinate plane, a straight line with negative slope goes through points (2, 6), (4, 5).
On a coordinate plane, a curve opens down.
On a coordinate plane, a straight line with positive slope goes through points (5, 2) and (6, 3).
On a coordinate plane, a straight line with positive slope goes through points (3, 3) and (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:

i am unable to solve this problem

step-by-step explanation:

0.02

step-by-step explanation:

time of 9 192 631 770 periods of the radiation corresponding to the transition between the 2 hyperfine levels of the ground state of the caesium 133 atom at 0 k (but other seconds are sometimes used in astronomy)