Select two values for x, evaluate y at these two values, pair the selected x values with the resulting ys to create two ordered pairs. Plot the ordered pairs and then construct a line through them.
if x = 0, y = 0, therefore (0,0) is on the line.
if x = 3, y = -1, therefore (3,-1) is on the line.
Note: The values I picked were arbitrary. You could have chosen any two values for x. I picked ones that would make the arithmetic easy and result in non-fractional values for y.