Rudy writes the sample work below.

18 = 2x + 6

18 + (-6) = 2x + 6 + (-6)

Which property did Rudy use?

A: addition property of equality

B: transitive property of equality

C: reflexive property of equality

D; multiplication property of equality

Rudy used the addition property of equality or also called as property of equality. It enable Rudy to add a the same number in both sides of equation to be able to give him an equivalent equation. It is the most use properties in solving equations.