6. A farmer is inslalling a chicken pen in the shape of a square. He placed a corner of the enclosure at $(-5.25,-5.25)$. What is the location of the corner that reflects $(-5.25,-5.25)$ across the $y$ axis? (Example 2 )

Step 1 ：The problem is asking for the reflection of a point across the y-axis. 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.

Step 2 ：Given point is (-5.25, -5.25).

Step 3 ：Change the sign of the x-coordinate of the given point (-5.25, -5.25).

Step 4 ：The reflected point is (5.25, -5.25).

Step 5 ：The location of the corner that reflects (-5.25,-5.25) across the y axis is \( \boxed{(5.25, -5.25)} \).