SOLUTION: At 2pm in Anchorage, Alaska the temperature is 11 degrees fahrenheit, at 9pm the temperature was -10 degrees fahrenheit. What was the average temperature change per hour.

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Question 307551: At 2pm in Anchorage, Alaska the temperature is 11 degrees fahrenheit, at 9pm the temperature was -10 degrees fahrenheit. What was the average temperature change per hour.
Answer by Earlsdon(6294) About Me  (Show Source):
You can put this solution on YOUR website!
The average change per hour would be indicated by the slope of the line defined by its endpoints: (x%5B1%5D,y%5B1%5D) = (2, 11) and (x%5B2%5D,y%5B2%5D) = (9, -10)
m+=+%28y%5B2%5D-y%5B1%5D%29%2F%28x%5B2%5D-x%5B1%5D%29 Make the appropriate substitutions...
m+=+%28-10-11%29%2F%289-2%29
m+=+%28-21%29%2F7
highlight%28m+=+-3%29
The average temperature change is -3 degrees fahrenheit per hour.