Solve 4 equations with 4 unknowns

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Before the programming, I recommend some time with the algebra (should be something you have done back in high school).
This is a good start in solving systems of equations which will get up through using Gaussian elimination and an introduction to matrices for solving these: http://www.purplemath.com/modules/systlin1.htm
This will extend the idea of Gaussian elimination to basic matrix algebra: http://www.mathcentre.ac.uk/resource...agrams/5_6.pdf
Once you have that, review the help files for the MINVERSE() and MMULT() function. https://support.office.com/en-us/art...90033e188#bm13

Once you understand the basic ideas behind solving systems of equations and the matrix algebra behind them, then it should be a relatively straightforward to program that solution into Excel.

If that takes care of your original question, please select Thread Tools from the menu link above and mark this thread as SOLVED. Thanks.