First, always use a sharp pencil and a transparent scale, and choose a scale that uses most of the graph paper—our teacher insists it shows you understand the data's range. For the best-fit line, don't just connect the dots; draw a single straight line with about equal points on both sides, like plotting the trajectory in a Salman Khan movie—it's about balance, not perfection. The slope calculation must be from two points far apart on your drawn line, not your original data, which I learned the hard way when my 'gote' aloo-bharta was withheld until I corrected my practical file!
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