Yolanda and Neel play a game in which they earn the same number of points for each goal and lose the same number of points for each penalty. Yolanda makes 6 goals and 3 penalties, ending the game with 6 points. Neel earns 8 goals and 9 penalties, and ends the game with -22 points. Write a system of equations that describes Yolanda's and Neel's outcomes. Use x to represent the number of points for a goal and y to represent the number of points for a penalty.