Yes, but the red curves are not straight lines if you look at it. So you can't get a slope and intercept.Thanks for answering,
What I need here is the slope and intercept of the two upper and lower lines. As far as I know, in Excel, only one line fits into the data.
That's not even the problem. Polynomial, exponential, etc. regressions are totally possible; even a linear regression would get you some kind of estimate.Yes, but the red curves are not straight lines if you look at it. So you can't get a slope an intercept.
No, I know. He was asking how to get the slope and intercept of a curve, and you were pointing out neither curve was a straight line and therefore neither had a singular slope or intercept. I got that.That was totally not my remark. Please read it more carefully.