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Module 3 Lesson 16 Symmetry in the Coordinate Plane.notebook
1
February 10, 2015
Jan 29­4:27 PM
Problem Set Lesson 14 Answers 
Module 3 Lesson 16 Symmetry in the Coordinate Plane.notebook
2
February 10, 2015
Feb 25­6:44 PM
Problem Set Lesson 15 Answers 
Module 3 Lesson 16 Symmetry in the Coordinate Plane.notebook
3
February 10, 2015
Feb 25­6:45 PM
Module 3 Lesson 16 Symmetry in the Coordinate Plane.notebook
4
February 10, 2015
Feb 25­6:45 PM
Module 3 Lesson 16 Symmetry in the Coordinate Plane.notebook
5
February 10, 2015
Aug 26­5:45 PM
 
MODULE 3 Rational Numbers
Topic C: Rational Numbers & the Coordinate Plane  
Lesson 16 Symmetry in the Coordinate Plane
Student Outcomes
§ Students understand that two numbers are said to differ only by signs if they are opposite of each 
other.  
§ Students recognize that when two ordered pairs differ only by sign of one or both of the 
coordinates, then the locations of the points are related by reflections across one or both axes.
Module 3 Lesson 16 Symmetry in the Coordinate Plane.notebook
6
February 10, 2015
Nov 17­2:29 PM
Opening Exercise
Give an example of two opposite numbers and describe where the numbers lie 
on the number line.  How are opposite numbers similar and how are they 
different?
Module 3 Lesson 16 Symmetry in the Coordinate Plane.notebook
7
February 10, 2015
Nov 17­2:29 PM
Locate and label the
points (3,4) and (-3,4)
They are in different quadrants.
Because the x‐coordinates are 
opposite, it is a reflection over 
the y‐axis
Module 3 Lesson 16 Symmetry in the Coordinate Plane.notebook
8
February 10, 2015
Nov 17­2:29 PM
Locate and label the
points (3,4) and (3,-4)
Module 3 Lesson 16 Symmetry in the Coordinate Plane.notebook
9
February 10, 2015
Nov 17­2:29 PM
Locate and label the
points (3,4) and (-3,-4)
Module 3 Lesson 16 Symmetry in the Coordinate Plane.notebook
10
February 10, 2015
Feb 10­9:55 AM
*to reflect over the x­axis, 
use the opposite of the y­coordinate
*to reflect over the y­axis, 
use the opposite of the x­coordinate
The rule for a reflection over the x­axis is (x,y)    (x,­y) . →
The rule for a reflection over the y­axis is (x,y)    (­x,y) . →
Module 3 Lesson 16 Symmetry in the Coordinate Plane.notebook
11
February 10, 2015
Nov 17­2:28 PM
Module 3 Lesson 16 Symmetry in the Coordinate Plane.notebook
12
February 10, 2015
Nov 17­2:28 PM
a. When the coordinates of two points are (x,y) and (-x,y) what line of
symmetry do the points share? Explain.
b. When the coordinates of two points are (x,y) and (x,-y) what line of
symmetry do the points share? Explain.
Module 3 Lesson 16 Symmetry in the Coordinate Plane.notebook
13
February 10, 2015
Feb 25­7:07 PM
As a table, follow with your finger along the
coordinate plane to follow my directions.
Then tell me.......Where are you?????
Module 3 Lesson 16 Symmetry in the Coordinate Plane.notebook
14
February 10, 2015
Feb 25­7:11 PM
Begin at (7,2). Move 3 units down, then reflect over the y-axis.
Where are you? (-7,-1)
Begin at (4, -5). Reflect over the x-axis, then move 7 units down, then to the
right 2 units. Where are you? (6,-2)
Begin at (-3, 0). Reflect over the x-axis, then move 6 units to the right. Move
up two units, then reflect over the x-axis again. Where are you? (3,-2)
Begin at (-2, 8). Decrease the y-coordinate by 6. Reflect over the y-axis , then
move down 3 units. Where are you? (2,-1)
Begin at (5, -1). Reflect over the x-axis, the reflect over the y-axis.
Where are you? (-5,1)
Module 3 Lesson 16 Symmetry in the Coordinate Plane.notebook
15
February 10, 2015
Aug 26­8:21 PM
Closing
Please take out your exit ticket for Lesson 16, close your
binder, and complete the exit ticket. This will be collected.
§ When the coordinates of two points differ only by one sign, such as (‐8, 2) and 
(8,2) what do the similarities and differences in the coordinates tell us about their 
relative locations on the plane?
§ What is the relationship between (5,1) and (5, ‐1)? Given one point, how can 
you locate the other?

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Mod 3 lessons 16