Final answer:
The Addition Property of Equality can be used to solve the equation X - 7 = 11.
Step-by-step explanation:
The property that could be used to solve the equation X - 7 = 11 is the Addition Property of Equality.
The Addition Property of Equality states that if you add the same number to both sides of an equation, the equation remains true. In this case, you can add 7 to both sides of the equation to get:
X - 7 + 7 = 11 + 7
X = 18
Therefore, the value of X is 18.