The angle between the lines `2x+y+4=0` and `y-3x=7` is

The angle between the lines x+y-3 =0 and x-y+3=0 is alpha and the acute angle between the lines x-sqrt(3y)+2sqrt(3)=0 and sqrt(3x)-y+1=0 is beta which one of the following is correct?

The angle between the lines x+y-3=0 .0=0 and x-y+3=0 is alpha and the acute angle between the lines x-sqrt(3)y+2sqrt(3)=0 and sqrt(3)x-y+1=0 is beta which one of the following is correct?

If the angle between the lines kx-y+6=0 and 3x-5y+7=0 is (pi)/(4) then K=

The equation of the bisector of the obtuse angle between the lines x-2y+4=0 and 4x-3y+2=0 is

The angle between the lines => 2x=3y=-z and -6x=y=4z is: