Transformation 1: Reflection

Flipping a figure is a ...

• Rotation

• Reflection

• Dilation

• Translation

What is a reflection?

• When you turn an object around a point.
• When you slide an object form one place to another.
• When you flip or mirror an object across a line.
• When you resize an object.

What is the rule for a reflection over the x-axis?

• (x, y) --> (x, -y)

• (x, y) --> (-x, y)

• (x, y) --> (-y, x)

• (x, y) --> (y, -x)

What is the rule for a reflection over the y-axis?

• (x, y) --> (x, -y)

• (x, y) --> (-x, y)

• (x, y) --> (-y, x)

• (x, y) --> (y, -x)

Which answer shows a reflection across the x-axis?

• d
• c
• b
• a

Which answer shows a reflection across the y-axis?

• a
• b
• c
• d

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

• y-axis
• x-axis

Reflect the point (2, -4) over the y-axis.

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

Reflect (6, -3) over the line x-axis.

• (6, 3)
• (-6, -3)
• (-3, 6)
• (3, -6)

Triangle ABC has vertices A(5,2).  Find the coordinates of ABC after a reflection over the x-axis.

• A’(5, -2)
• A’(-5, -2)
• A’(-5, -2)
• A'(5,2)