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Instructor Overview

Students reflect a figure across one of the axes on the coordinate plane and name the vertices of the reflection. As they are working, students look for and make use of structure to identify a convention for naming the coordinates of the reflected figure.

Key Concepts

  • When point (m,n) is reflected across the y-axis, the reflected point is (−m,n).
  • When point (m,n) is reflected across the x-axis, the reflected point is (m,−n).
  • When point (m,n) is reflected across the origin (0,0), the reflected point is (−m,−n).

Goals and Learning Objectives

  • Reflect a figure across one of the axes on the coordinate plane.
  • Name the vertices of the reflected figure.
  • Discern a pattern in the coordinates of the reflected figure.