Choose a scale that uses most of the graph paper, label your axes with units, and plot points as neat crosses. The best-fit line should balance the points, not connect them. For the slope, use two points far apart on *your* line, not the data points.
Back in Chennai, plotting server load graphs taught me the examiner isn’t looking for truth, but for clarity. My old chemistry teacher, Miss Radha, would always say, “The graph is your argument, not your diary.”
So really, the slope calculation is where you show your working—neatly, in a box—more than where the line actually falls.
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