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OpenStudy (anonymous):
choose the new equation after the expression equivalent to x from the second equation is substituted into the first equation of these two3x + 2y = –21and x – 3y = 4. Here are the choices. A)3x + 2(3y + 4) = –21 B)3x + 2(–3y + 4) = –21 C)3(3y + 4) + 2y = –21 D)3(–3y + 4) + 2y = –21
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