SOLUTION: Please help: Fill in the reason for the following proof: Given: PQ = 5 & QR = 5. Prove: PR = 10

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Question 799844: Please help:
Fill in the reason for the following proof:
Given: PQ = 5 & QR = 5. Prove: PR = 10
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!

Given: PQ+=+5 & QR+=+5
Prove: PR+=+10
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if PQ+=+5 & QR+=+5 => PQ+=+QR

if PQ+=+QR => by definition, Q is the midpoint of PR and
PR=PQ%2BQR
PR=5%2B5
PR=10