If the equation `2x^2-2xy-y^2-6x+6y+c=0` represents a pair of lines then `c=`

If the equation 2x^(2)-3xy+y^(2)-kx+5y+6=0 represents a pair of line, then k=

If the equation 2x^2+5xy+3y^2+6x+7y+=0 represents a pair of lines, then the equation of pair of lines parallel to then and passing through the point (0,1) is

If the equation 2x^(2)+5xy+3y^(2)+6x+7y+4=0 represents a pair of lines,then the equation of pair of lines parallel to them and passing through the point (0,1) is

If the equation x^(2)+3xy+2y^(2)+x-y+k=0 represents a pair of line, then k=

If the equation a x^2-6x y+y^2 +2gx +2fy +c=0 represents a pair of lines whose slopes are m and m^2, then the value(s) of a is/are

If 3x^(2)+xy-y^(2)-3x+6y+K=0 represents a pair of lines , then K=

The equation 6x^(2)-xy-12y^(2)-8x+29y-14=0 represents a pair of lines, then the angle between them is ..............?

The equation 6x^(2)-xy-12y^(2)-8x+29y-14=0 represents a pair of lines, then the angle between them is ..............?

Show that the equation 2x^2-xy-3y^2-6x+19y-20=0 represents a pair of intersecting lines. Show further that the angle between them is tan^(-1) (5) .

If 2x^(2)+xy-3y^(2)+4x+ky-6=0 represents a pair of lines then k=