If two lines 4x+3y+5=0  and lx+my+4=0 are the angular bisectors of two lines then the relation between l,m is

The angle between angular bisectors of any two intersecting lines is 90∘ If two lines a1x+b1y+c1=0 and a2x+b2y+c2=0 are perpendicular then a1a2−b1b2=0 Here 4x+3y+5=0 and bx+my+4=0 are perpendicular.  Therefore, 4l−3m=0