Questions in pair-st-lines

Select	Question
	The equation ${{(x+y)}^{2}}-({{x}^{2}}+{{y}^{2}})=0$ represents
	If the slope of one of the lines represented by $a{{x}^{2}}+2hxy+b{{y}^{2}}=0$ be the square of the other, then
	Two lines represented by equation ${{x}^{2}}+xy+{{y}^{2}}=0$ are
	If the equation $hxy+gx+fy+c=0$ represents a pair of straight lines, then
	The equation of pair of straight lines perpendicular to the pair $a{{x}^{2}}+2hxy+b{{y}^{2}}=0$ is
	The values of h for which the equation $3{{x}^{2}}+2hxy-3{{y}^{2}}-40x+30y-75=0$ represents a pair of straight lines, are
	The equation of lines passing through the origin and parallel to the lines $y={{m}_{1}}x+{{c}_{1}}$ and $y={{m}_{2}}x+{{c}_{2}}$ is
	The equation of the lines represented by the equation $ab({{x}^{2}}-{{y}^{2}})+({{a}^{2}}-{{b}^{2}})xy=0$ are
	The equation ${{(x-5)}^{2}}+(x-5)\,(y-6)\,-2\,{{(y-6)}^{2}}=0$ represents
	A second degree homogenous equation in x and y always represents

1 2 3 ... 16 Next