Suppose NOL -> QRM is a reflection across the x-axis. If O(9, 4) what is the y coordinate of R?

Elementary Geometry For College Students, 7e
7th Edition
ISBN:9781337614085
Author:Alexander, Daniel C.; Koeberlein, Geralyn M.
Publisher:Alexander, Daniel C.; Koeberlein, Geralyn M.
Chapter10: Analytic Geometry
Section10.1: The Rectangular Coordinate System
Problem 35E: Determine the area of ABC if A=2,1,B=5,3,andC is the reflection of the B across the x-axis.
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Suppose NOL -> QRM is a reflection across the x-axis. If O(9, 4) what is the y coordinate of R?

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