Answer two questions about Systems A and B: System A System B
−4x−6y=9 −4x−6y=9
3x+y=−4 −x−5y=5
1) How can we get System B from System A? Choose 1
A. Replace only the right-hand side of one equation with the sum/difference of the right-hand sides of both equations.
B. Replace one equation with the sum/difference of both equations.
C. Swap only the left-hand sides of both equations.
D. Swap the order of the equations.
2) Based on the previous answer, are the systems equivalent? In other words, do they have the same solution? Choose 1
(Choice A)
Yes
(Choice B)
No
please actually answer and ill give thank you :) !

In khan academy, the answer is Replace one equation with sum/difference of both equations.

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: