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22-07-2019
Mathematics

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Аноним Аноним

22-07-2019

Answer:

C. 2x - 3(-3x - 4) = -21.

Step-by-step explanation:

y + 3x = -4

2x - 3y = -21

From the first equation y = -3x - 4.

Substituting this for y in the second equation, we have:

2x - 3(-3x - 4) = -21.

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