Answer:
Both the Addition Property of Equality and the Additive Identity Property
Explanation:
This is Because we know the The Addition Property of Equality means or defines If two expressions are equal to each other, and you add the same value to both sides of the equation, the equation will remain equal. So that would show or represent the Step 1
And for Step two it is The Additive Identity Property because we know that defines : an identity element (such as 0 in the group of whole numbers under the operation of addition) that in a given mathematical system leaves unchanged any element to which it is added.
This is why the correct answer is.... "Both the Addition Property of Equality and the Additive Identity Property"