Example TSAGEHor.0: Suppose $y$ is a function of $x$ given by the equation $y = f (x) = 2x+ 3$.
The table, graph, and mapping diagram of this function have been created using SAGE.

In this mapping diagram, the axes are horizontal and the arrows point vertically.

This visualization is not preferred:

SAGE: Demonstrating table, graph, and mapping diagram(Horizontal Axes).