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# Use of Solve Block for a complex set of Simultaneous equations

## Use of Solve Block for a complex set of Simultaneous equations

(OP)
Hi

Being new to MathCad, I have written a set of 30 equations, with 22 variables, in my version of the two-layer model for slurry flow.  The problem is this, of the 22 variables inputted, 16 are fixed.  In order to reach a solution of the six equations present, requires that the parameters for each equation to be calculated.  In other words, the six variables that need to be calculated are not directly represented in the six equations that need to be solved, but have to be calculated via other equations and variables.  How do I do This? Can Solve Block be used for this?

I have tried to use solve block, but it keeps given the error "This Variable or Function is not defined", when clearly I have defined each variable.  What am I doing Wrong?

### RE: Use of Solve Block for a complex set of Simultaneous equations

Get a 10 day trial of TK Solver. What you are describing is exactly what TK Does best because it is Rule Based not procedural and has iterative solving for non-linear equations.

### RE: Use of Solve Block for a complex set of Simultaneous equations

Perhaps it would be best if you could figure a way to post your sheet.  It sounds like you may need to create functions such as F(x,y) =: x^2 = 3*y, where the parameters are assigned as shown.  If you can't figure out how to post here, go to the Mathcad collab site (http://collab.mathsoft.com/~mathcad2000).  Post under whichever section seems appropriate to you.  You are guaranteed to get an answer...

rjw57

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