The scatterplot shows the relationship between the altitude above sea level, , in kilometers, and the average temperature, , in degrees Celsius, for various locations. A line of best fit is also shown. The line passes through approximately and .
Based on the line of best fit, which of the following statements best describes the meaning of the slope in this context?
For every 1 kilometer increase in altitude, the average temperature decreases by approximately 2 degrees Celsius.
For every 1 degree Celsius increase in temperature, the altitude increases by approximately 2 kilometers.
At sea level, the average temperature is approximately 15 degrees Celsius.
The average temperature decreases by approximately 15 degrees Celsius for every 2 kilometers increase in altitude.
