In the figure, , and both lines are intersected by transversal t. Complete the statements to prove that m∠1 = m∠5. (given)

m∠1 + m∠3 = 180° (Linear Pair Theorem)

m∠5 + m∠6 = 180° (Linear Pair Theorem)

m∠1 + m∠3 = ∠5 + ∠6 (
)

m∠3 = m∠6 (
)

m∠1 = m∠5 (Subtraction Property of Equality)