document.write( "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. \n" ); document.write( "

Algebra.Com's Answer #220010 by Earlsdon(6294) $\"\"$ $\"About$

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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)
\n" ); document.write( " $\"m+=+%28y%5B2%5D-y%5B1%5D%29%2F%28x%5B2%5D-x%5B1%5D%29\"$ Make the appropriate substitutions...
\n" ); document.write( " $\"m+=+%28-10-11%29%2F%289-2%29\"$
\n" ); document.write( " $\"m+=+%28-21%29%2F7\"$
\n" ); document.write( " $\"highlight%28m+=+-3%29\"$
\n" ); document.write( "The average temperature change is -3 degrees fahrenheit per hour. \n" ); document.write( "

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