isaiahh223gLv4

3 May 2022

Given: m A = m B, m A = 9x - 20, and m B = 43  

Prove: x = 7

Statement:                  Reason:

1. m A = m B                    1. Given

2. m A = 9x - 20                   2. Given

3. m B = 43                         3. Given

4. 9x - 20 = 43                        4. Substitution

5. 9x = 63                                5. Addition Property of Equality

6. x = 7                                    6. [?]

 

Select the reason that best supports Statement 6 in the given proof.

A. Multiplication Property of Equality

B. Subtraction Property of Equality

C. Division Property of Equality

D. Addition Property of Equality