Please refer to picture:
asdf.jpg
1) How do I include multiple best fit lines (blue lines)?
2) How do I include coordinates of their intersecting points?
3) How do I indicate the center points of the lines with shapes, their coordinates, and include a legend?
4) How do I include major and minor gridlines?
5) How do I find the curve of the 1st derivative of the original curve, include the new curve on the same chart as before, and include a y-axis on the right sight of the chart labeled ΔpH/ΔV? (Not shown).
Thank you
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