The y axis is vertical and the x axis is horizontal.
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The answer depends on the orientation of the cube. If it is balanced on an edge or a vertex it has no horizontal or vertical faces. If it is resting on a face then it has 2 horizontal and 4 vertical faces.
Oblique
the term for the ratio of vertical change over horizontal change is slope
Vertical is up and down, and horizontal is left to right.
A vertical or horizontal stabilizer helps the plane to be balanced