The equation ax +2hxy+ by? +c= 0, ab # 0 represents a pair of real and...

 

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The equation ax² +2hxy+ by? +c= 0, ab # 0 represents a pair of real and parallel lines. If and only if (A) ab - h = 0 and c<0 (B) ab – h? = 0 and abc <0 (C) ab – h? = 0, ac <0 and be <0 (D) ab – h? = 0, and e<0 The equation ax² +2hxy+ by? +c= 0, ab # 0 represents a pair of real and parallel lines. If and only if (A) ab - h = 0 and c<0 (B) ab – h? = 0 and abc <0 (C) ab – h? = 0, ac <0 and be <0 (D) ab – h? = 0, and e<0