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Given1 and B2 form a linear pair,
2 and 3 are complementary, and m 1 = 120
Prove: m 3=120
 
             Statement:                                         Reason:
1. 1 and 2 form a linear pair                   1. Given
2. m 1+ m 2=180                                2. [?]
3. 2 and 3 form a linear pair                   3. Given
4. m 2+ m 3 = 180                               4. Linear Pair Postulate
5. m 1+ m 2 = m 2+ m 3                 5. Substitution
6. m 1 = m  3                                      6. 
7. m 1 = 90                                            7. Given
8. 120= m  3                                          8. Substitution
9. m 3 = 120                                          9. Symmetric Property 
 
Select the reason that best supports Statement 2 in the given proof.
A. Transitive Property of Equality
B. Subtraction Property of Equality
C. Linear Pair of Postulate
D. Division Property of Equality

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