Math Chapter Wise The Line And General Equation Of Second Degree And Its Classification English MCQ UP PGT 2021 UPPSC Ashram Paddhati 2021 Q.If the equation hxy + gx + fy = c, h ≠ 0 represents a pair of straight lines, then Afc + gh = 0 Bfh + cg = 0 Cgf + ch = 0 Dgc + f2 = 0 Show answer Correct answer: gf + ch = 0