I remember it this way:
X is a cross because it goes across,
Y is a y because it points to the sky!
http://www.business-analysis-made-easy.com/image-files/xy-axis.gif
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Just label one axis x and the other axis y. Voila!! x y graph!
x= horizontal(flat) y=vertical(up and down)
The x-axis is the horizontal axis on a graph. The y-axis is the vertical axis on a graph.
The convention for an x-y graph is as follows: y | | |_____ x where the x-axis is horizontal and the y-axis is vertical.
A linear graph contains both an x and y axis.