Final answer:
To find the final image of point P' after reflecting figure P in line a and then line b, perform two reflections.
Step-by-step explanation:
In this question, the student is asked to describe a single transformation that maps point P' if we reflect figure P in line a and then line b.
To find the reflection image of point P', we can perform the following steps:
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- Reflect point P' across line a to get point P''.
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- Reflect point P'' across line b to get the final image of point P'.
By performing these two reflections, the student will be able to find the final image of point P'.