Select the correct answer.
Which equation combines with the given equation to form a system of equations with the solution x = 3 and y = 9?
x + 2y = 21
A.
OB.
O C.
O D.
OE.
4x+6y=64
2x+y = 36
4x + y = 21
-3x + 4y = 33
3x + 2y = 28



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