Answer :
Given that:
AC = AB + BC and BC + CD = CD
The property that describes this will be the substitution property of equality.
Therefore, we have:
AB + BC = BC + CD
ANSWER:
Substitution property

Given that:
AC = AB + BC and BC + CD = CD
The property that describes this will be the substitution property of equality.
Therefore, we have:
AB + BC = BC + CD
ANSWER:
Substitution property