The combined equation of lines `2x+y+3=0` and `x-y+4=0` is

Find the combined equation of the lines 2x + 3y = 0 and x - 2y = 0

The equation of the straight line perpendicular to the straight line 3x+2y=0 and passing through the point of intersection of the lines x+3y-1=0 and x-2y+4=0 is

If two pairs of straight lines with combined equations xy + 4x - 3y - 12 = 0 and xy - 3x + 4y - 12 = 0 form a square. Then, the combined equation of its diagonals is