Elena notices that when she spends less time on social media the night before a quiz, she gets a higher score. Before one quiz, she spent 107 minutes on social media and earned 37 points on a quiz. Before another quiz, she spent 73 minutes on social media and earned 41 points on a quiz. Write a function to model a linear relationship between Elena's social media usage, in minutes, and her quiz scores, assuming that the total number of points on each quiz remains a constant.