Question 52712
Because any two points determine a straight line, you need to have two ordered pairs to draw the line defined by y=x-1.  Just pick any value of x you want and substitute it into the equation to solve for y.  Do that again to get a second ordered pair, plot both of your points (ordered pairs), and connect with a straight line.  The graph is: {{{graph(300,300,-5,5,-5,5,x-1)}}}