Math Chapter Wise Tangent, Normal, Increasing, Decreasing And Maxima/Minima Of A Function Of One Variable English MCQ UP PGT-2016 (02-02-2019) Q.If line ax+by+c=0 is a normal to the curve xy=4, then Aa< 0, b < 0 Ba > 0, b > 0 Ca > 0, b < 0 Da < 0, b = 0 Show answer Correct answer: a > 0, b < 0