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

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

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

a(x^(2)-y^(2))+xy=0 represents a pair of straight lines for

a(x^(2)-y^(2))+xy=0 represents a pair of straight lines for

Show that 9x^2+24xy+16y^2+21x + 28y+ 6 =0 represents a pair of parallel straight lines and find the distance between them .

Distance between the parallel lines 16x^(2)+24xy+ ly^(2)+kx-12y-21=0 represents a pair of parallel lines is

Does x^(2)+y^(2)=0 represent a pair of straight lines