Rachel hikes at a steady rate from a ranger station to a campground. A line graph shows her distance y from the ranger station, in miles, after x hours. What does the slope of the line graph represent? 1 Rachel's initial distance from the campground.
2 Rachel's final distance from the ranger station.
3 The rate at which Rachel's distance from the ranger station changes per hour.
4 The rate at which Rachel's hiking from the ranger station changes per mile.