Well...to be honest - no! I know what it is but I have never used it in my practice. Most of my math work has been associated with imaginary number operations (in impedance's in RF) and most of the rest I have done trough simulation and then tuning. Very little math - you can call me a "modern" engineer, I do lack some of the basics in math and I was never good at it.

You mean this operation? https://www.mathsisfun.com/algebra/line-equation-2points.html

Well, I feel ashamed... Yes, I do know this, and no - I did not think of it...

Thank you for the valuable lessons!!! I think I will manage the rest, I hope!