The value of 'p' for which the equation `x^2+pxy+y^2-5x-7y+6=0` represents a pair of straight lines , is

The equation x^(2)+kxy+y^(2)-5x-7y+6=0 represents a pair of straight lines, then k is

The equation x^(2)+kxy+y^(2)-5x-7y+6=0 represents a pair of straight lines, then k is

The value of k for which the equation 2x^2+5y^2-2kxy+4x+6y=0 represent the pair of straight lines is

A value of p for which the equation x^(2)+p x y+y^(2)-5 x-7 y+6=0 represents a pair of lines is

The value of k for which the equation 2x^2+5y^2-2ky+4x+6y=0 represent the pair of straight lines is

The value of lambda for which the equation x^(2)-y^(2)-x-lambda y-2=0 represent a pair of straight line,are