She reflected the quadrilateral across the y-axis to create quadrilateral PꞋRꞋSꞋTꞋ.

Which rule describes this transformation?

The rule for reflecting a point across the y-axis is to change the sign of the x-coordinate while keeping the y-coordinate the same. If a point \((x, y)\) is reflected across the y-axis, it becomes \((-x, y)\).

Therefore, the rule describing the reflection of quadrilateral PRST across the y-axis to create quadrilateral \(P'R'S'T'\) is:

\[
(x, y) \rightarrow (-x, y)
\]

Would you like more details or have any questions about reflections or transformations?

Here are 5 related questions to explore further:
1. How would the rule change if the quadrilateral were reflected across the x-axis?
2. What would the rule be for reflecting the quadrilateral across the line \(y = x\)?
3. How can you determine the coordinates of the new vertices after reflection?
4. What is the effect of reflecting a shape twice across two different axes?
5. How does reflection differ from rotation and translation in transformations?

**Tip:** Always check the orientation of the shape after transformation to ensure it hasn't been distorted.

She reflected the quadrilateral across the y-axis to create quadrilateral PꞋRꞋSꞋTꞋ. Which rule describes this transformation?

Understand the process of reflecting a quadrilateral across the y-axis to create quadrilateral P'R'S'T'. This solution explains the reflection rule (x, y) → (-x, y) and how it applies to transformations on the coordinate plane. Suitable for Grades 7-9 students.

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