Two friends are both on a local running team. They run at the exact same rate of 7 miles per hour. They are running the exact same race course, but one friend starts running an hour after the other friend. Does a two-equation, two-variable system of equations that models their distances from the starting line have one solution, no solution, or infinite solutions? Let the y-axis be distance and the x-axis be time, where t=0 is when the first runner begins. What if the two friends start the race at the same time?