If two pairs of lines $$x^2-2mxy-y^2=0$$ and $$x^2-2nxy-y^2=0$$ are such that one of them represents the bisector of the angles between the other, then

The distance of the point (1, 2) from the line $$x+y+5=0$$ measured along the line parallel to $$3x-y=7$$ is equal to

The slopes of the lines, which make an angle 45$$^\circ$$ with the line $$3x-y=-5$$, are

If 3 and 4 are intercepts of a line L = 0, then the distance of L $$\equiv$$ 0 from the origin is