if the lines Ax + By +C = 0 and ax + by +c =0 cut the coordinate axis at the concylic points then find relation between A ,a , B , b

let the 1st line cut the axes at points A , D

let the 2nd line cut the axes at points B , C

so A=(-C/A ,0) , D=(0, -C/B)

and B=(-c/a,0)  , C=(0, -c/b)

now consider OA.OB=OC.OD where O is (0,0)

hence u get aA=bB