5th Grade · Geometry
X-axis
5.G.A.1
Definition
The horizontal number line on the coordinate plane.
Examples
- Starting at (0, 0) and moving 4 units right along the x-axis lands at (4, 0).
- The x-axis runs left to right through the origin.
Key rule
The x-value in an ordered pair tells how far to move along the x-axis.
Memory hook
X is x-tra flat — it runs side to side.