# How to solve 3 functions in 4 variables

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Mohamed Mahmoud on 24 Oct 2020
Answered: John D'Errico on 25 Oct 2020
Tan = 2 - c - a
Man = b + c - 1
Lan = a - 3*b - c + d - 1
a=d
b=d-1
c= 2-d

madhan ravi on 24 Oct 2020
Use solve() to get the answer what you show
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madhan ravi on 25 Oct 2020
Show what you have tried.

John D'Errico on 25 Oct 2020
3 equations with 4 variables is called an underdetermined problem. There is effectively no solution. If you are willing to parameterize the problem, leaving one of the variables an unknown, then you can solve 3 equations in 3 variables, with the answer as a function of the 4th variable.
That seems to be what you are asking for. And the solution is simple. Just use solve. Pick the three variables you wish to solve the problem for, and the last variable will be left as a parameter.

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