"Iterations > 100";
    }else{
        results.innerHTML = "Iterations = " + last_iterations;
    }
    // solution
    var sxy = solve_2(solver_1_eq_1[0], solver_1_eq_1[1], solver_1_eq_1[2],  solver_1_eq_2[0], solver_1_eq_2[1], solver_1_eq_2[2]);
    results.innerHTML += "<br>";
    results.innerHTML += "Solution found: (" + cur_x.toFixed(3) + "; " + cur_y.toFixed(3) + "), ";
    results.innerHTML += "<i>actual solution: (" + sxy[0].toFixed(3) + "; " + sxy[1].toFixed(3) + ")</i>";
    error = length_of(sxy