If The Equation  represents A Pair Of Lines, Then k is Equal To

The product of perpendiculars let fall from the point (x₁, y₁) upon the lines represented by ax² + 2hxy + by², is

The angle between the The Pair of Straight Lines

The pair of lines represented by 3ax² + 5xy + (a² – 2)y² = 0 are perpendicular to each other for 

The angle between the pair of lines represented by 2x² – 7xy + 3y² = 0, is   

The angle between the lines represented by , is

If the angle θ is acute, then the acute angle between 

If θ is the acute angle between the lines given by x² – 2pxy + y² = 0, then,

If the coordinates axes are the bisectors of the angles between the pair of lines ax² + 2hxy + by² = 0, then

 bisect angles between each other, then

The equation y² – x² + 2x – 1 = 0 represents.