Mathematics, 20.05.2021 04:40, RKT28

HELP NEEDED PLEASE !! WILL GIVE BRAINIEST What equation combines with the given equation to form a system of equations with the solution x = 3 and y = 9? x + 2y = 21

A. 4x + 6y = 64

B. 2x + y = 36

C. 4x + y = 21

D, 3x + 2y = 28

Answers: 1

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HELP NEEDED PLEASE !! WILL GIVE BRAINIEST What equation combines with the given equation to form a...