It really doesn't matter. But most of time, when most people draw graphs,
the x-axis is horizontal (lying down) and the y-axis is vertical (standing up).
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The x-axis represent the horizontal line while the y-axis represents the vertical line.
How about remembering "y goes to the sky" since the y-axis is the vertical axis.
The y- axis in the vertical axis and the x-axis in the horizantal axis
The side is the WRONG answer. A Y axis is up and down and a X axis is left and right. Easiest way to remember is Y to the sky, X to the side. Also, the Z axis is front to back.
In the coordinate plane, the x-axis is horizontal, and the y-axis is vertical.