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Mathematics, 07.10.2019 02:30 ashley232323

Which equation combines with the given equation to form a system of equations with the solution x = 3 and y = 9?

a. x + 2y = 21

b.4x + 6y = 64

c.2x + y = 36

d.4x + y = 21

e.-3x + 4y = 33

f.3x + 2y = 28

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