SOLUTION: AB+BC=AC AB=XY XY+BC=AC What is the reason?

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Question 656010: AB+BC=AC
AB=XY
XY+BC=AC
What is the reason?
Found 2 solutions by DrBeeee, MathLover1:
Answer by DrBeeee(684) About Me  (Show Source):
You can put this solution on YOUR website!
Equals added to equals are equal.

Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!
reason: use of transitive property of segment length