How would I answer this proof on 5 lines?

Question

prove that Q is the mid point of PR is PQ is equal to 17, QR is equal to 17, and Q is between P and R

Answer 1

Given: PQ=17;

QR=17;

Q is between P and R

Prove Q is the midpoint of PR

Statement #1: PR = PQ + QR , by distance postulate

Statement #2: PQ=17 = QR = x : transitive property; substitution

Statement #3: PR = x+x = 2x : substitution; combines like terms

Statement #4: (1/2)PR = x = PQ = QR: division property of equality;

substitution

Therefore Q is the midpoint of PR because it is exactly halfway between P and R

[end of proof]