Values of k so that equation `16x^(2)+24xy+ky^(2)+7x-12y-21=0` represents a pair of parallel lines is

If 9x^(2)-24xy+ky^(2)-12x+16y-12=0 represents a pair of parallel lines then k=

If 16x^(2)+24xy+9y^(2)+kx-12y-21=0 represents a pair of parallel lines then distance between them is

The equation 16x^(2)+y^(2)+8xy-74x-78y+212=0 represents

The value of k so that the equation 12x^(2)-10xy+2y^(2)+11x-5y+k=0 represents a pair of lines is -2 (b) 2(c)7 (d) -7

The value of k so that the equation 12x^(2)-10xy+2y^(2)+11x-5y+k=0 represents a pair of lines is a.-2 b.2 c.7d.-7

6x^(2)+hxy+12y^(2)=0 represents pair of parallel straight lines, if h is

The equation 12x^(2)+7xy-12y^(2)-18x+y+6=0 represents

The equation x^(2)+k_(1)y^(2)+k_(2)xy=0 represents a pair of perpendicular lines if

Show that the equation 2x^(2) + xy - y^(2) + x + 4y - 3 = 0 represents a pair of lines.