Questions in pair-st-lines

Select	Question
	If the sum of slopes of the pair of lines represented by $4{{x}^{2}}+2hxy-7{{y}^{2}}=0$is equal to the product of the slopes, then the value of h is
	The gradient of one of the lines of $a{{x}^{2}}+2hxy+b{{y}^{2}}=0$ is twice that of the other, then
	The equation ${{x}^{2}}+kxy+{{y}^{2}}-5x-7y+6=0$ represents a pair of straight lines, then k is
	The equation $2{{x}^{2}}+4xy-k{{y}^{2}}+4x+2y-1=0$ represents a pair of lines. The value of k is
	Separate equations of lines, for a pair of lines, whose equation is ${{x}^{2}}+xy-12{{y}^{2}}=0$, are
	The value of k so that the equation $2{{x}^{2}}+5xy+3{{y}^{2}}+6x+7y+k=0$ represents a pair of straight lines, is
	If the equation $3{{x}^{2}}+xy-{{y}^{2}}-3x+6y+k=0$ represents a pair of lines, then k is equal to
	Equation $3{{x}^{2}}+7xy+2{{y}^{2}}+5x+5y+2=0$ represents
	For what value of $'p'$, ${{y}^{2}}+xy+p{{x}^{2}}-x-2y=0$ represents two straight lines
	If the equation $2{{x}^{2}}+7xy+3{{y}^{2}}-9x-7y+k=0$ represents a pair of lines, then k is equal to