Pick a value, any value, for x. Substitute that value in place of x in the equation. Do the arithmetic to determine the resulting value of y. With the value of x and the value of y form an ordered pair (x,y). Plot this point on your graph.
Pick a different value for x and repeat the above process.
Draw a line all the way across your graph through the two plotted points.
Hint: Pick values for x like 0 or 1 to make the arithmetic easier.