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an x Axis is the fancy name for the horizontal line on the bottom of a bar graph
It is the base/face of a certain shape, as in a square, it would be the bottom line(the one on/closest to the ground).
The naive, rough and ready method is as follows: Find the mean values of the two variables and mark this "mean point" on the scatter plot. Draw a set of axes through that point. The line of best fit will pass though the "mean point" and will go either from bottom-left to top-right or top-left to bottom-right. There should be approximately as many points above the line as below and these must be approx equally distributed on either side on the "mean" point. A more systematic approach is statistical and entails the calculation of the "least squares equation" using regression.
a line of fit mean perfect line.
the bottom of it