In a proof it is known for line segments that AB + BC = BC+CD. Which of the following would allows us to conclude AB and CD have the same length? the whole is the sum of its parts (2) the addition axiom (3) the subtraction axiom (4) the substitution axiom​

In a proof it is known for line segments that AB BC BCCD Which of the following would allows us to conclude AB and CD have the same length the whole is the sum class=