The equation of a straight line passing through the point of intersection of \( x-y+1=0 \) and \...
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The equation of a straight line passing through the point of intersection of \( x-y+1=0 \) and \( 3 x+y-5=0 \) and perpendicular to one of them, is
(A) \( x+y+3=0 \)
(B) \( x-y-3=0 \)
(C) \( x-3 y-5=0 \)
(D) \( x-3 y+5=0 \)
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