If ax -y + 4x -y=0 represents a pair of lines, then a is equal to : (a) - 16 (b) 16 (c) 4 (d) – 4

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( f ) [ 9 x^{2}+6 y^{2}+2 n x y+28 x+2 f y+c=0 text { is } ] a pair of lines them [ begin{array}{c} a b c+2 n+g-a f^{2}-b g^{2}-c n^{2}=0 a=a quad g=2 end{array} ] so here [ begin{array}{l} b=-1 quad f=-frac{1}{2} h=0 end{array} ] Put values in [ begin{array}{c} -aleft(frac{1}{4}right)+4=0 a=16 end{array} ]

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