pair-st-lines

Related Questions

• 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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• The lines joining the points of intersection of curve $5{{x}^{2}}+12xy-8{{y}^{2}}+8x-4y+12=0$ and the line $x-y=2$ to the origin , makes the angles with the axes

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• 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

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• The equation $12{{x}^{2}}+7xy+a{{y}^{2}}+13x-y+3=0$ represents a pair of perpendicular lines. Then the value of ‘a’ is

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• 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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