title: How do I plot the graph for |x|+|y|=1 ranging from -1 to 1
body: <p>What is the proper syntax for plotting the graph of |x|+|y|=1 ranging from -1 to 1.
  Those are the absolute value of x and y, and I do not need to generate x and y. I am new to MATLAB and I simply do not understand how to do this.
  Thanks for any help!</p>