Solving non linear system

0 = x^3 + x^2 + x + 4 + 2*y;

0 = x + y - 3;

Answer 1

[Star Strider]

Use the Symbolic Math Toolbox:

syms x y 
S = vpasolve([0 == x^3 + x^2 + x + 4 + 2*y;
           0 == x + y  - 3]); 
x = S.x
y = S.y

.

[Gabriel Costa]

thanks @Star Strider!

[Star Strider]

As always, my pleasure!