I have statements. i only need reasons thank you!

            Statement                                                       Reason  m∠EGF = 60° & m∠AGF = 90°                                   Given∠EGF + ∠AGF + ∠AGB = 180° Definition of supplementary angles60° + 90° + ∠AGB = 180°                                           Substitution150° + ∠AGB = 180°                                         Add the the similar values∠AGB = 180° - 150°                        Subtraction property of equality∠AGB = 30°                                                                 AnswerYou are free to arrange any of the reasons (and statements) as you wish.I just want to give you the main idea. Hope this helps.