Find the image of: 5,2,-7) in the xy-planes.

Explanation

We have to Find the image of (5,2,-7) in the xy-plane.
since the image is drawn to the xy-plane so the co-ordinate of x & y will not change after the reflection.
but z co-ordinate will become negative.
hence The image of: (5,2,-7) in the xy plane is (5,2,7).