AnswersSRC 2022 MJ Grade 8 Pre-Algebra Q1Congruence and Transformations

Congruence and Transformations Answers

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1
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The final image is the same as which of the following transformations?

A
Translate 5 units down, and then reflect over the x-axis.
B
Translate 5 units down, and then reflect over the y-axis.
C
Rotate 180° about the origin.
D
Reflect over the x-axis, and then translate 5 units left.
3

The final image is the same as what single transformation?

A
a translation 2 units to the left and 2 units down
B
a reflection across the y-axis
C
a 180° rotation about the origin
D
a clockwise rotation 90° about the origin
4

Which sequence of transformations produces L'M'N' from LMN?

A
a translation 5 units down and 2 units to the right followed by a reflection across the y-axis
B
a reflection across the y-axis followed by a translation 5 units down and 2 units right
C
a translation 5 units down and 2 units to the left followed by a reflection across the y-axis
D
no sequence of transformations
6

a reflection across the y-axis followed by a clockwise rotation 90° about the origina reflection across the x-axis, followed by a counter-clockwise rotation 90° about the origin, followed by a translation 4 units down and 4 units to the lefta counter-clockwise rotation of 90° about the origin followed by a translation 4 units to the rightno sequence of translations, rotations, and reflections because the images are not congruent

A
a reflection across the y-axis followed by a clockwise rotation 90° about the origin
B
a reflection across the x-axis, followed by a counter-clockwise rotation 90° about the origin, followed by a translation 4 units down and 4 units to the left
C
a counter-clockwise rotation of 90° about the origin followed by a translation 4 units to the right
D
no sequence of translations, rotations, and reflections because the images are not congruent
7

Choose all sequences of transformations that produce the same image of a given figure.

A
a reflection across the x-axis followed by another reflection across the x-axis
B
a reflection across the y-axis followed by a counter-clockwise rotation 90° about the origin
C
a rotation of 180 degrees followed by another rotation of 180 degrees
D
a translation to the right followed by an equal translation to the left
E
a rotation 90° about the origin followed by a counter-clockwise rotation 90° about the origin
8

Do you think a sequence of translations across the x- or y-axis and/or reflections on a figure could result in the same image as a 90-degree clockwise rotation? Explain why or why not.

Answer:

No, it is not possible. A 90-degree clockwise rotation changes the position of the x- and y-coordinates (transforming (x, y) into (y, -x)). Translations and reflections across the x- or y-axis only change the signs or values of the coordinates, but they cannot swap the order of the x and y values itself. Therefore, you cannot achieve the same result as a rotation using only these transformations.

9

Check all that you included in your response.

A
It is not possible.
B
The coordinates need to be reversed.
C
You cannot reverse coordinates using only reflections and translations.

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