Answer:
No, it is not substitution property. Addition property of equality justifies the statement.
Step-by-step explanation:
The given statement: If
.... (1)
them
... (2)
According to the Addition property of equality, if a,b and c are real number, then
Using Addition property of equality, add 3 on both sides in equation (1).
This equation is same as equation (2).
Therefore Addition property of equality justifies the statement.