How to linear fit two y variables in same plot?

Hello,

I ploted (x1,y1) and (x2,y2) in same plot where all variables are different. I want to find linear fit for each of them ie x1,y1 and x2,y2 , However, the basic fit ui let me choose either data 1 or data 2 linear fit, but not both. How can I fit both data series simultaneously? thank you.

Answer 1

[Walter Roberson]

polyfit(x1, y1, 1)

Answer 2

[Torsten]

Choose X = [x1,x2], Y = [y1,y2] as data to be fitted.