pair-st-lines

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• If the equation $12{{x}^{2}}-10xy+2{{y}^{2}}+11x-5y+k=0$ represents two straight lines, then the value of k is

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• The equation of pair of straight lines joining the point of intersection of the curve ${{x}^{2}}+{{y}^{2}}=4$ and $y-x=2$ to the origin, is

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