pair-st-lines

Related Questions

• The lines joining the origin to the points of intersection of the curves $a{{x}^{2}}+2hxy+b{{y}^{2}}+2gx=0$ and $a'{{x}^{2}}+2h'xy+b'{{y}^{2}}+2g'x=0$ will be mutually perpendicular, if

  ---

• The equations of the lines represented by the equation $a{{x}^{2}}+(a+b)xy+b{{y}^{2}}+x+y=0$ are

  ---

• The distance between the parallel lines $9{{x}^{2}}-6xy+{{y}^{2}}+18x-6y+8=0$ is

  ---

• Which of the equation represents the pair of perpendicular straight lines

  ---

• The equation ${{x}^{2}}+k{{y}^{2}}+4xy=0$represents two coincident lines, if $k =$

  ---