Reply To: How to reproduce least squares line with a plotted function May 27, 2019 at 8:57 pm #919 Bill FinzerKeymaster Hi, The following should work: 2.39*x-5.6 2.39*Day-5.6 Or you could create two sliders, a and b, adjusted to -5.6 and 2.39. Then you would plot b + a*Day or b + a*x I hope that helps, Bill