The tangent to the curve y2 - xy + 9 = 0 is vertical when y=?
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dddddddddddddddddddddddddddddddddddddddddddddddddddddddd
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ddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddd
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