Why does the solution show the starting point of P as (7,4) instead of (7,-4) as shown in the graph

Algebra: Structure And Method, Book 1
(REV)00th Edition
ISBN:9780395977224
Author:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Publisher:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Chapter1: Introduction To Algebra
Section1.8: Number Lines
Problem 57WE
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Why does the solution show the starting point of P as (7,4) instead of (7,-4) as shown in the graph

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