How to change the value of a variable?

i have following simple code which solves two equations for two unknowns, the two equations are 2*x(1)+x(2)-4 and x(1) +2*x(2)-5 in which x(1) and x(2) are unknowns and the below code gives the values of unknowns that,s fine. Now i want to make this code flexible in a sense that the program should take different values of x(1) and x(2) so that i can verify the equations using different values of the two unknowns. for example using x(1)=1 and x(2)=2 the equations give 4 and 5 respectively, in the next iteration i should be able to give different values of x(1) and x(2) to verify it,

here is the code

function F = myfun(x)
F = [2*x(1) + x(2) - 4;
    x(1) + 2*x(2) - 5];
end

clc;
clear;
close all;
x0 = [1; 2];
fsolve(@myfun,x0)

kindly help, Regards Asad

[Walter Roberson]

I do not understand? With x(1) = 1 and x(2) = 2 then the equations appear to give [0 0], which you can verify by calling myfun([1 2])