You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: visualizeBoundaryLinear.m
    path of file: ./repos/Coding-Guide/Notes/ml/coursera/machine-learning-ex6/ex6
    
    the code of the file until where you have to start completion: function visualizeBoundaryLinear(X, y, model)
%VISUALIZEBOUNDARYLINEAR plots a linear decision boundary learned by the
%SVM
%   VISUALIZEBOUNDARYLINEAR(X, y, model) plots a linear decision boundary 
%   learned by the SVM and overlays the data on it

    
function visualizeBoundaryLinear(X, y, model)
%VISUALIZEBOUNDARYLINEAR plots a linear decision boundary learned by the
%SVM
%   VISUALIZEBOUNDARYLINEAR(X, y, model) plots a linear decision boundary 
%   learned by the SVM and overlays the data on it

w = model.w;
b = model.b;
xp = linspace(min(X(:,1)), max(X(:,1)), 100);
yp = - (w(1)*xp + b)/w(2);
plotData(X, y);
hold on;
plot(xp, yp, '-b'); 
hold off

end