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If you mean 12x+3y = -9 and -8x-2y = 14 then they are y = -4x-3 and y = -4x-7 respectively which means that they are parallel lines because they both have the same slope of -4 but with different y intercepts

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Q: Are the lines 12x plus 3y-9 and -8x-2y14 parallel?
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