Issue in solving two Non Linear Simultaneous Equations with multivariable function to optimize.

Hi, I am a student and I am facing issue in solving

1) two Non Linear Simultaneous Equations with 3 variable function (x,y,z).

2) Further, I want to generate 2 curves for x& y values for having z value ranging between [0.1 to 2] and two identify the intersection of those two curves with tangent line.

Please Help me out in solving this issue with the Code.

The two Non Linear Equations is attached with the image for reference.PFA

Answer 1

[Torsten]

Give z a numerical value and solve for x and y using MATLAB's "fsolve".