Engineering Entrance Exams
A family of curves is such that the length intercepted on the y-axis between the origin and the tangent at a point is three times the ordinate of the point of contact. The family of curves is
(A) xy = c, c is a constant (B) xy2 = c, c is a constant (C) x2y = c, c is a constant (D) x2y2 = c, c is a constant