document.write( "Question 939207: Examine the graph and consider trips more than 7,000 miles by a Boeing 777. Use a rate of change to estimate how the maximum payload decreases as the distance traveled increases.
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Algebra.Com's Answer #572271 by TimothyLamb(4379) $\"\"$ $\"About$

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slope = m
\n" ); document.write( "m = dy/dx
\n" ); document.write( "m = (120000-0)/(7000-15000)
\n" ); document.write( "m = -15
\n" ); document.write( "---
\n" ); document.write( "y - 120000 = -15(x - 7000)
\n" ); document.write( "y = -15(x - 7000) + 120000
\n" ); document.write( "where:
\n" ); document.write( "x = distance traveled (must be between 7000 and 15000 miles)
\n" ); document.write( "y = maximum payload (pounds)
\n" ); document.write( "---
\n" ); document.write( "example 1:
\n" ); document.write( "x = 7000 miles
\n" ); document.write( "y = -15*(7000 - 7000) + 120000
\n" ); document.write( "y = 120000 pounds
\n" ); document.write( "---
\n" ); document.write( "example 2:
\n" ); document.write( "x = 11000 miles
\n" ); document.write( "y = -15*(11000 - 7000) + 120000
\n" ); document.write( "y = 60000 pounds
\n" ); document.write( "---
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