Reflection Rules

Reflection Rules

February 9, 2021

Reflection

Represents the flipping of an image

When an object is reflected, the pre-image and image are always congruent (SAME SIZE AND SAME SHAPE)

Reflection through the origin

Rules

• Over the x-axis  (x, -y) = This means keep the sign of x and change the sign of y 

• Over the y-axis (-x, y) = This means change the sign of x and keep the sign of y 

• Through the origin (-x, -y) = This means change the sign of both x and y 

Multiple Choice

Which answer shows a reflection across the x-axis?

• d

• c

• b

• a

Multiple Choice

Point C (-5, 4)

Reflect over the x-axis.

What is C'?

• (5, 4)

• (-5, -4)

• (5, -4)

• (-5, 4)

Multiple Choice

What would be the coordinates of point K if it was reflected over the Y-axis?

• (-5, 2)

• (5, 2)

• (5, -2)

Multiple Choice

What would be the coordinates of point K if it was reflected over the x-axis?

• (-5, -2)

• (-5, 2)

• (5, -2)