MATLAB: Solve two equations for two unknown variables

Question

how can i solve two equations for two unknown variables?

like these two:

z=f1(x)+f2(y)
z=f3(x)+f4(y)

for z=0

please help, thx in advance.

Answer 1

G*m = d

G = [f1,f2;f3,f4];
d = [z1;z2];
m = G\d;
x = m(1);
y = m(2);