Use of 'fzero' or 'fsolve' for function files which have two input variable?

Hi,

I have two function files: funpvsol(t,x) and funhsol(t,x) which gives the value of pressure and enthalpy respectively. These function files are based on nonlinear equations.

Now i have situation where I already know the pressure and enthalpy and have to calculate value of 't' and 'x', which are input to both the function files. So basically it is a problem of two nonlinear equations with two unknowns. In mathematical form:

P=f(t,x)........Eq.1 and h=f(t,x)........Eq.2 I know the value of 'P' and 'h'.

Can i use any of the matlab inbuilt functions such as 'fsolve' or 'fzero' to handle this situation?

P.S. i can not differentiate the equations as they have large no. of constants and have a series solution.

Thanks.