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OpenStudy (anonymous):
If you were to use the substitution method to solve the following system, choose the new equation after the expression equivalent to x from the second equation is substituted into the first equation. 3x + 2y = –21 x – 3y = 4 A) 3x + 2(3y + 4) = –21 B) 3(–3y + 4) + 2y = –21 C) 3x + 2(–3y + 4) = –21 D) 3(3y + 4) + 2y = –21
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