Final answer:
To solve for x in the equation 2x - 3 = 9, we would use the Addition property of equality first.
Step-by-step explanation:
To solve for x in the equation 2x - 3 = 9, we need to isolate x on one side of the equation. The first property of equality we would use is the Addition property of equality. This allows us to eliminate the constant term by adding 3 to both sides of the equation.
By adding 3 to both sides, we get 2x = 12. Now, we can proceed to solve for x by applying other properties of equality like the Multiplication property of equality to cancel out the coefficient of x.
So, the correct answer to this question is A) Addition property of equality.