Click and *hold* the coloured circle next to y1 to change the appearance of data points.
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To do a straight line of best fit, enter the equation of a line of best fit (y=mx+b) but with y1 and x1 instead of y and x, and with a ~ sign instead of =. This tells Desmos to do a line of best fit (regression line.) Then you can see the coefficients and the r^2 value below -- you should include these in your report.
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You can use almost any type of mathematical function for a line of best fit in Desmos, entering the equation the same way.
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