The Y axis is the vertical access, in other words the one that goes up and down. The X access is horizontal and so it goes across a chart. The Y axis is sometimes known as the value axis.
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In transformations a reflection across the x axis produces a mirror image
The x-axis runs horizontally across the graph and the y-axis runs vertically on it.
Y axis going up; and X axis going across.
It is f(x) = -x^2.
X axis goes across (horizontal) Y axis is up and down (vertical)