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In most charts you must always label the axes.
The variables that you are plotting on the graph!
The horizontal axis would normally be the independent variable and the vertical axis would be the residual.
If you start the axes from any value other than zero make that very clear with large "lightning flashes" on the axes. Try not to, but sometimes it is unavoidable. If plotting the population of your town or city over time, it would make little sense to go back to year 0! Show the values opposite grid marks along the axes. Label the axes clearly with the variable plotted on it.
First, a coordinate. A coordinate is a number. It labels a point on a line.Second, a coordinate axis is a line with coordinates.to label a point in a plane (a flat surface), we need more than one coordinate axis, and we place a second at right angles to the first.Those axes are called rectangular coordinate axes, because they are at right angles to one another. The coordinates on them are called rectangular coordinates. They are also called Cartesian coordinates.