Distinguish Acute Angle Bisectors and Obtuse Angle Bisectors

Q. The equation of the bisector of the lines 4x+3y-6=0 and 5x+12y+9=0 containing the origin is given by .

1. 7x-9y-3=0
2. 7x+9y+3=0
3. 7x+9y-3=0
4. 7x-9y+3=0

Q. If $m$ is the slope of obtuse angle bisector between the lines $3x-4y+7=0$ and $12x+5y-2=0,$ then the value of $|55m|$ is equal to