Select the correct answer from each drop-down menu. in the figure, , and both lines are intersected by transversal t. complete the statements to prove that ∠2 and ∠8 are supplementary angles. (given) m∠2 = m∠7 () m∠7 + m∠8 = 180° () m∠2 + m∠8 = 180° (substitution property) ∠2 and ∠8 are supplementary (definition of supplementary angles)