Solve the system by substitution.

y = 2x

3x + 2y = 21

A.

x = 3, y = 6

B.

x = 6, y = 3

C.

x = 3, y = - 6

D.

x = - 6, y = 3

Which of the following is equivalent to 4x - 2y = 16

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Convert each measure to degrees. Round answers to the nearest hundredth if needed. a.) π/9 b.) - 2π/3

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