Kate and Nate 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. Kate makes 6 goals and 3 penalties, ending the game with 6 points. Nate earns 8 goals and 9 penalties and ends the game with -22. Write a system of equations that describe Kate and Nate's outcomes. Use x to represent the number of points for a goal and y to represent the number of points for a penalty.