Andre and Noah started tracking their savings at the same time. Andre started with $15 and deposits $5 per week. Noah started with $2.50 and deposits $7.50 per week. The graph of Noah's savings is given and his equation is y = 7.5x + 2.5, where x represents the number of weeks and y represents his savings. Write an equation for Andre's savings and graph it alongside Noah's. What does intersection point mean in this situation?