Ok. The graphing method is really easy. Your equations are easy. I'll tell you as cleary as possible how to graph it. Ok. First, you have to solve for each variable for each equation. You can solve for y if x = 0, and solve for x if y = 0. The answers will come out as a fraction, so just take a good guess where the plotted point should be. After you have solved the first equation, draw a straigh line between them.
For the second equation, do the same thing. However, YOU NEED TO PAY ATTENTION TO THE MINUS SIGN. The minus sign makes y NEGATIVE Y. Continuing, solve for x and y. If y = 0, what does x equal and vice versa. This answer will be a whole number. Remember, Y IS NEGATIVE. Make sure you plot them correctly on the graph. The only reason I am not giving you the answer is because that would be cheating. If you are still confused, view this video. It is exactly how I learned it when I was studying this topic.
https://www.khanacademy.org/math/algebra/systems-of-eq-and-ineq/systems-through-examples/v/graphings-systems-of-equations