In the given equation , solve the homogeneous differential equation in terms of x and y. A homogeneous differential equation is an
equation of the form
M(x, y) dx +N(x, y) dy = 0
where M and N are homogeneous functions of the same degree. To solve an equation of this form by the method of separation of variables, use the substitutions y = vx and dy = x dv + v dx.
xy dx + ( y2 - x2 ) dy = 0