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Since perpendicular lines have their slopes as negative reciprocals, the negative reciprocal of the given slope (3) is -1/3. Therefore the a value is -1/3.
Y - (-5) = -7
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Simplify
y + 5 = -7
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Subtract 5 from each side
y + 5 - 5 = -7 - 5
y = -12
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y = -12 is your answer