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

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

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

Find the joint equation of the lines x+y-3 =0 and 2x+y-1 =0

The joint equation of the line x-y=0 and x+y=0 is

The joint equation of the lines x+2y-1=0 and 2x-3y+2=0 is

The joint equation of the lines 3x+2y-1=0 and x+3y-2=0 is

Find the combined equation of the lines passing through the origin such that (1) one is parallel to x + 2y = 5 and other is perpendicular to 2x - y + 3 = 0. (2) which are perendicular to the lines 3x + 2y -1 = 0 and x -3y + 2 = 0