Reflections Rule

Given pre-image point (1,-4)

Plot the pre-image & image after a reflection over the line x = 2

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5

Given pre-image point (6,2)

Plot the pre-image & image after a reflection over the line y = -3

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5

What is a reflection across the x-axis of point A(-2, -1)?

• a.  (2,1)

• b.  (-2,1)

• c. (1,-2)

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5

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

• y-axis

• x-axis

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5

What is the sequence of transformations for the image given?

• Reflect over the x-axis, translate (x+8,y)

• Reflect over the x-axis then translate (x+6, y)

• Reflect over the y-axis then (x+1, y+1)

• Translate down 4 (y-4) and to the right 5 (x+5)

Answer explanation

The orientation of the labels indicate that the figure was reflected, not rotated, as they are mirrored from the original preimage.

Then, a translation would result in the figure being positioned where it is shown.

Tags

CCSS.8.G.A.3

A figure is located entirely in the third quadrant. If it is reflected over the y-axis, in which quadrant will its image lie? 

• 1st

• 2nd

• 3rd

• 4th

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5

When reflecting across the x-axis, _________ and _________.

• x-coordinates stay the same

• y-coordinates stay the same

• x-coordinates are opposites

• y-coordinates are opposites

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5

When reflecting across the y-axis, _________ and _________.

• x-coordinates stay the same

• y-coordinates stay the same

• x-coordinates are opposites

• y-coordinates are opposites

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5

What type of transformation is a reflection?

• Isometry

• Dilation

• Expansion

• Contraction

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5

Which coordinate rule correctly shows reflecting the original coordinate ( x , y ) over the x-axis?

• ( -x , y )

• ( x , -y )

• ( y , x )

• ( x , y )

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5