1. **Problem:** Reflect square BCDE with vertices B(-6,7), C(-2,6), D(-3,2), E(-7,3) across the y-axis.
2. **Formula and rule:** Reflection across the y-axis changes a point $(x,y)$ to $(-x,y)$.
3. **Apply the reflection:**
- $B(-6,7) \to B'(6,7)$
- $C(-2,6) \to C'(2,6)$
- $D(-3,2) \to D'(3,2)$
- $E(-7,3) \to E'(7,3)$
4. **Final coordinates:**
- $B'(6,7)$
- $C'(2,6)$
- $D'(3,2)$
- $E'(7,3)$
This completes the reflection of the square BCDE across the y-axis.
Reflection Y Axis 18F19D
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