Congruency and Similarity

Example 1: \( \triangle ABC \sim \triangle PQR \). Here \( \angle A = 70^\circ \), \( \angle B = (5y - 3)^\circ \), \( \angle C = (4x - 4)^\circ \), \( \angle P = 70^\circ \), \( \angle Q = 62^\circ \) and \( \angle R = 48^\circ \). Find \( x \) and \( y \).