The plots are driven by sets of points. The values of the points have been derived from functions, but as far as the Excel sheet knows they are just sets of points.
That could be done in this case, but we are trying to find a more general solution for when the function may not explicitly known but implied by a collection data. I am gathering, however, that Excel doesn't have a specific tool that does that. I was hoping it might be something they provided, similar to the trendline functionality that is built in that would plot the result automatically, thereby adjusting and replotting it whenever the data changed a little.
Excel has SLOPE and INTERCEPT functions that give parameters for linear best fit function for (X, Y) datasets. Next you can solve system of two linear equations using excel functions: calculate determinat to test number of solutions (MDETERM),reverse matrix (MINVERSE, table array function), multiply matrix by matrix (MMULT, table array function).
The table array functions has to be entered by selecting proper output range (2x2 or 2x1 cells) and entered with CTRL+SHIFT keys (as standard array function).
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