Two lines `9x^2 + y^2 + 6xy – 4 = 0` are

Two lines 9x^(2)+y^(2)+6xy4=0 are

The pair of lines 9x^(2)+y^(2)+6xy-9=0 are

The figure formed by the pairs of lines 6x^(2) + 13xy + 6y^(2) = 0 and 6x^(2) + 13xy +6y^(2)+ 10x + 10y + 4 = 0 is a

Distance between two lines represented by the line pair, x^2 – 4xy + 4y^2 + x – 2y – 6 = 0 is

Distance between the pair of lines represented by the equation x^(2)– 6xy +9y^(2)+ 3x - 9y -4 = 0 is

9x^(2) +2hxy +4y^(2) +6x +2fy - 3 = 0 represents two parallel lines. Then

9x^(2) +2hxy +4y^(2) +6x +2fy - 3 = 0 represents two parallel lines. Then