Coordinate Grid

Congruent Shapes: Reflection on a Coordinate Grid

​I already know X-axis and Y-axis lines
I know that the opposite of positive is negative.
I know that the opposite of negative is positive.



Now we put that knowledge to work on a coordinate plane.

​You reflect over the X-axis or over the Y-axis.

If you reflect over the X-axis
--The X number stays the same
--The Y number becomes the opposite (Positive <---> Negative)


What do you think happens if you reflect over the Y-axis?
---The Y number __________
---The X number __________

Multiple Choice

State the line of reflection.

• Reflection across

  Y-axis

• Reflection across

  X-axis

Multiple Choice

Flipping a figures is a ...

• Rotation
• Reflection
• Dilation
• Translation

Multiple Choice

Reflecting over the y-axis CHANGES the ____-_____________.

• Y-coordinate number

• X-coordinate number

Multiple Choice

Which point is the image of point B(-2, 4) reflected over the x-axis?

• (2, 4)
• (2, -4)
• (-2, -4)
• (-2, 4)

Multiple Choice

Triangle GHI is reflected across the x-axis.  What are the coordinates of I'?

• (-2, 6)
• (2, 6)
• (-6, -2)
• (6, 2)

Multiple Choice

When reflecting over the x-axis, which coordinate stays the same?

• x-coordinate

• y-coordinate

• Both coordinates stay the same

• Both coordinates change

Multiple Choice

Reflecting over the y-axis CHANGES the ____-_____________.

• y-coordinate

• x-coordinate

Multiple Choice

Reflections over the x-axis change the ____-__________. 

• y-coordinate
• x-coordinate

Multiple Choice

When reflecting over the y-axis, which coordinate stays the same?

• x-coordinate

• y-coordinate

• Both coordinates stay the same

• Both coordinates chage

Multiple Choice

Is the picture being reflected in the y-axis or x-axis?

• y-axis
• x-axis