pair-st-lines

Related Questions

• Difference of slopes of the lines represented by equation ${{x}^{2}}({{\sec }^{2}}\theta -{{\sin }^{2}}\theta )-2xy\tan \theta +{{y}^{2}}{{\sin }^{2}}\theta =0$is

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• The equation ${{x}^{2}}+{{k}_{1}}{{y}^{2}}+{{k}_{2}}xy=0$ represents a pair of perpendicular lines, if

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• The equation of the bisectors of the angle between the lines represented by the equation ${{x}^{2}}-{{y}^{2}}=0$, is

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• The equation of the lines passing through the origin and parallel to the lines represented by the equation $2{{x}^{2}}-xy-6{{y}^{2}}+7x+21y-15=0$, is

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• If the equation $2{{x}^{2}}+7xy+3{{y}^{2}}-9x-7y+k=0$ represents a pair of lines, then k is equal to

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