Statement 1: m∠8=(4x+25) and m∠6= (5x+12) and x=13
Reason: Given
Statement 2: m∠8=77 and m∠6= 77
Reason: Substitute x for 13
Statement 3: m∠8=m∠6
Reason: Transitive theorem of Equality
Statement 4: ∠8=∠6
Reason: Definition of congruent angle
Statement 5: m || n
Reason: Converse of congruent angles postulate