6th Grade · The Number System
Reflection
6.NS.C.6b
Definition
A mirror image of a point across an axis, which changes the sign of one coordinate.
Examples
- (3, 2) reflected over the y-axis becomes (-3, 2).
- Reflecting across an axis flips the sign of one coordinate.
Key rule
Reflecting a point is like a mirror image across an axis.
Memory hook
Flip the sign, mirror the point.