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The value k for which 4x^2+8x y+k y^2=9 ...

The value `k` for which `4x^2+8x y+k y^2=9` is the equation of a pair of straight lines is__________

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The equation `4x^(2)+8xy+ky^(2)-9=0` represents a pair of straight lines if `(4)(k)(-9)-(4)^(2)=0ork=4`.
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