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Hello, I really need help with this!

Hello, I really need help with this!-example-1
User Xbel
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1 Answer

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1. Given
2. Definition of Supplementary Angles
3. First Substitution
4. Subtraction property of Equality
5. Second Substitution
6. Exterior Side in Opposite Rays
7. If corresponding angles are equal, then lines are parallel
User Jawan
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