Unit 2: Logic & Proof Homework 6: Algebraic Proof Directions: Name the property of equality that justifies each statement.

1. If a = 2b then a - c = 2b - c

2. x = x

3. 3(p - 7) = 3p - 21

4. If - 7k = - 42 , then k = 6

5. If m + n = 15 and n = 2 , then m + 2 = 15

6. If x/4 = - 5 , x = - 20

7. If w ^ 2 = 2x and 2x = y , then w ^ 2 = y

8. If c - 9 = - 1 then c = 8

9. If n = - 3 , then - 3 = n