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Complete the proof.

Given: r | | s

Prove: angle 2, angle 8 are supplementary

1) $$r \parallel s$$ (given)
2) $$\angle 2$$ and $$\angle 4$$ are supplementary (angles that form a linear pair are supplementary)
3) $$\angle 4 \cong \angle 8$$ (corresponding angles theorem)
4) $$\angle 2$$ and $$\angle 8$$ are supplementary (substitution)