To find the line through points in Desmos, make a table and type y₁ ~ mx₁ + b. Desmos gives the slope m, the y-intercept b, and one more number: r, the correlation coefficient. When all the points sit exactly on a line, r = 1 if the slope is positive and r = −1 if the slope is negative. That stays true even with more than two points, as long as they are all on the line.
Chapters:
0:00 Desmos table and y₁ ~ mx₁ + b
1:49 What m, b and r mean
2:39 Positive slope: r = 1
2:59 Negative slope: r = −1
3:14 All points on the line
Air K Math – Math, one shot at a time
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