The y axis represents the vertical co-ordinates whereas the x axis represents the horizontal co-ordinates.
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The x-axis usually represents the independent variable, while the y-axis represents the dependent variable.
A graph has both an x and y axis.
Assuming the graph is linear, all equations will follow the formula y = mx + c, where "mx" represents the gradient of the line; "c" is the y-intercept i.e. where the graph crosses the y-axis.
Y axis
In general, y-axis values are the values that depend on the x-axis values.