Use the problem 48 to determine the family of trajectories or thogonal to each given family in

Question:

Use the problem 48 to determine the family of trajectories or thogonal to each given family in Problem.
In problem 48
When a one-parameter family of curves satisfies a first-order DE, we can find another such family as solution curves of a related DE with the property that a curve of the other family orthogonally. Each family constitutes the set of orthogonal trajectories for the other.