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.