Thanks Valery, Alan and Werner,
A few follow up questions though:
Valery: that example in the picture looks like exactly what I need (including making the data appear in a table), except I still need to figure out how to force the line of best fit to go through (0,0). Also, I couldn't open your xmcd file in my Academic Version of Mathcad Prime 2.0 - the XMCD converter button is greyed out. Would you be able to convert the file to an MCDX file for me and re-attach it?
Werner: you've used "genfit" to find the best fitted line through (0,0), but I don't understand the input parameters. Do you know of a tutorial on genfit I can refer to?
Alan: I do have the intercept function in my version, but Valery was referring earlier to a function called "lintercept":
"See please Matthcad functions slope, intercept, lintercept etc"
Also, my problem is now not finding the slope and intercept, but rather finding the slope of the best fit line that must pass through (0,0). And also putting the data into a table, but once I can open Valery's file, that should be sorted.
Thanks for everyone's patience,
Benson