Reason number 1. Always is Given
Reason 2: Substitute 13 for x, to continue solving this problem, we must
substitute the value, so this the reason.
Reason 3. Transitive property of equality ( if 8 = 77 and 6 = 77, then, 8 = 6)
Reason 4. Definition of congruent angles. If two angles measure the same, they are congruents.
Reason 5. Converse of corresponding angles postulate.