Doing something wrong in Matcad. What is it?

11/13/17

I hope someone can help me. I am using MathCad 15 Academic (professional?) and have a problem that involves several variables, e.g. x ,y, z,  that are implicit functions of a range variable, ϴ = 0, 0.1,…1,  e.g. 0 = f(ϴ,x,y,z).   I want to obtain explicit functions, e.g. x(ϴ, y), so that I can graph  x(ϴ, y) vs ϴ in order to determine if a supremum is at a boundary or interior value of ϴ.

            I have several such variables, e.g. y(ϴ,z), which are part of a more complex function, e.g. G(ϴ, x(ϴ, y), y(ϴ,z)), that I want to evaluate in terms of a supremum for ϴ.  Using the “find” function in MathCad I have successfully obtained values of x, y, and G, for each of the values of ϴ and manually inserted these into a vector, e.g. x(ϴ, y).  However, I have not created a function as I cannot graph x(ϴ, y) against ϴ.   Evidently, there is something simple which I am not doing (despite my many attempts).  I hope someone can tell me what I should be doing.   Thanks.  Jim