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

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

Find the acute angle between the lines 7x-4y =0 and 3x-11y +2=0.

Find the angle between the lines 3x+5y=7,2x-y+4=0

Find the angle between the lines x+3y-8=0 and 2x-3y+6=0 .

Find the angle between the lines x+3y-8=0 and 2x-3y+6=0 .

Find the angle between the lines x-2y+3=0 and 3x+y-1=0 .

Find the angle between the lines x-2y+3=0 and 3x+y-1=0 .

Find the angle between the lines 4x+y=3 and x/2+y=4/7

Find the equations of the bisectors of the angles between the lines 12x +5y - 4 = 0 and 3x + 4y + 7 = 0 .Prove that bisectors are at right angles to each other .

Find the equations of the bisectors of the angles between the lines 12x+5y-4=0 and 3x+4y+7=0 .