Reflections on a Coordinate Plane (Day 2)

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Reflections on a Coordinate Plane (Day 2) We are learning to…create and identify reflections. Friday, November 16, 2018

Standard MCC6.NS.6b Understand signs of number in ordered pairs as indicating locations in quadrants of the coordinate plane; recognize that when two ordered pairs differ only by signs, the locations of the points are related by reflections across one or both axes. MCC6.NS.8 Solve real-world and mathematical problems by graphing points in all four quadrants of the coordinate plane. Include use of coordinates and absolute value to find distances between points with the same first coordinate or the same second coordinate.

Reflections on a Coordinate Plane Today we will be performing reflections on a coordinate plane. The x-axis and y-axis will be our lines of reflections. we will be counting the spaces on the coordinate plane in order to determine the distance between a point and the line of reflection.

Example #1: Reflect the object below over the x-axis: Name the coordinates of the original object: A A: (-5, 8) B: (-6, 2) D C C: (6, 5) D: (-2, 4) B Name the coordinates of the reflected object: A’: (-5, -8) B’ B’: (-6, -2) D’ C’: (6, -5) C’ D’: (-2, -4) A’ How were the coordinates affected when the object was reflected over the x-axis?

Example #2: Reflect the object below over the y-axis: Name the coordinates of the original object: T T’ T: (9, 8) J: (9, 3) Y: (1, 1) J’ J Name the coordinates of the reflected object: Y’ Y T’: (-9, 8) J’: (-9, 3) Y’: (-1, 1) How were the coordinates affected when the object was reflected over the y-axis?

Example #3: Reflect the object below over the x-axis and then the y-axis: Name the coordinates of the original object: R Would it make a difference if we reflected over the y-axis first and then the x-axis? Try it! Then reflect about what you discovered. R: (-9, 9) P: (-8, 5) P D D: (-2, 4) U: (-9, 2) U Name the coordinates of the reflected object: R’’: (9, -9) U’ U’’ P’’: (8, -5) D’ D’’ D’’: (2, -4) P’’ P’ U’’: (9, -2) R’’ R’ How were the coordinates affected when the object was reflected over both the x-axis and y-axis?