[tex]x^o\ and\ 3y^o\ are\ Corresponding\ Angles.\\\\Corresponding\ Angles\ are\ equal. Therefore\ we\ have\ equation:\\\\x^o=3y^o\ and\ x^o+y^o=180^o[/tex]
[tex]Substitute:\\\\3y^o+y^o=180^o\\\\4y^o=180^o\ \ \ \ |:4\\\\y^o=45^o\\\\x^o=3\cdot45^o=135^o[/tex]
Answer: x° = 135° and y° = 45°
