If two straight lines ax-by + 4 = 0 and (A-1) x + y + B = 0 are parallel and the distance from the origin of the coordinate to the two straight lines is equal, find the straightness of a and B

If two straight lines ax-by + 4 = 0 and (A-1) x + y + B = 0 are parallel and the distance from the origin of the coordinate to the two straight lines is equal, find the straightness of a and B

Parallel: - B (A-1) = a
The distance from the coordinate origin to the two lines is equal: 4 + B = 0
b=-4,a=4/3