Transformations on the Coordinate Plane
Grade 8 · CCSS 8.G.A.1 · Pairs with the Let's Get to the Point game
Name
Date
Translation: add to the coordinates, (x, y) → (x + h, y + k).
Reflection over the x-axis: (x, y) → (x, −y); over the y-axis: (x, y) → (−x, y).
Rotation about the origin: 90° counterclockwise (x, y) → (−y, x); 180° (x, y) → (−x, −y); 90° clockwise (x, y) → (y, −x).
Rotation about the origin: 90° counterclockwise (x, y) → (−y, x); 180° (x, y) → (−x, −y); 90° clockwise (x, y) → (y, −x).
Part A: Translations
1. Move (2, −1) by the rule (x − 4, y + 3).
Image: ( )
2. Move (−3, 5) 6 units right and 2 units down.
Image: ( )
3. Move (0, −4) by the rule (x + 5, y + 6).
Image: ( )
4. What rule moves (1, 1) to (−3, 4)?
(x , y )
Part B: Reflections
5. Reflect (5, 3) over the x-axis.
Image: ( )
6. Reflect (−2, 4) over the y-axis.
Image: ( )
7. Reflect (−6, −1) over the x-axis.
Image: ( )
8. Reflect (3, −7) over the y-axis.
Image: ( )
Part C: Rotations about the origin
9. Rotate (4, 1) 90° counterclockwise.
Image: ( )
10. Rotate (2, 5) 180°.
Image: ( )
11. Rotate (−3, 2) 90° clockwise.
Image: ( )
12. Rotate (6, −1) 270° counterclockwise.
Image: ( )
Part D: Put it on the grid
13. Plot A(−3, 2). Reflect it over the y-axis and label the image A′. Then rotate A′ 180° about the origin and label that image A″.
A′ ( ) A″ ( )
14. Find the mistake. Alex reflected (4, −2) over the x-axis and got (−4, −2). What did Alex do wrong? What's the correct image?
Correct: ( )
15. After any translation, reflection or rotation, is the new figure congruent to the original? Explain.
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