The x axis is the one that lies horizontal. It can be denoted by the equation y=0. A good way to remember this is to think "x is a cross" as in "x is across."
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graph x+4<5
The x-axis is the horizontal line on an x and y graph.
If an x-t graph is a position-time graph, velocity is the slope of the line on the graph.
The graph of the function y(x) = 1/x is a hyperbola.
A linear graph contains both an x and y axis.