The angle between the two lines `y-2x=9 and x+2y =-7,` is

CHOOSE the correct answer from the following alternative : the angles between the two planes x-y+2z=9 and 2x+y+z=7 is -

Find the angle between the two lines 2x=3y=-z and 6x=-y=-4z .

The angle between the planes kx+y-z=9 and x+2y+z=7 is (pi)/(3) then k =

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

The obtuse angle between the lines y=-2xand y=x+2 is

The obtuse angle between the lines y=-2xand y=x+2 is

The acute angle between the two lines' 7x - 4y = 0 and 3x -11y = 2 will be

The angle between the lines 2x+11y-7=0 and x+3y+5=0 is equal to

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