#### Answer

1, Given
2. Addition Property of Equality
3. Given
4. Substitution Property of Equality

#### Work Step by Step

Statement 1 is given in the problem. Statement 2 can be reached by adding c to both sides of the equation using the Addition Property of Equality. Statement 3 is given in the problem. Statement 4 can be reached by using the Substitution Property of Equality to replace "c" in statement 2 with "d".