7. Starting at 7:00 a. m., Lin spent a day hiking through a canyon. This graph shows her elevation (in meters) at some different times. Negative values of represent times earlier than noon, and positive values of represent times later than noon. a. What was Lin’s elevation at noon? Explain how you know. b. At 10:00 a. m., Lin’s elevation was 7 meters. Add this point to the graph. c. At 1:00 p. m., Lin was at sea level. Add this point to the graph. d. Did Lin’s elevation increase or decrease between 7:00 a. m. and 2:00 p. m.? Explain how you know. e. Lin climbed downward from 2:00 p. m. to 3:00 p. m. Add a point to the graph that shows her possible elevation at 3:00 p. m. Explain your reasoning.