document.write( "Question 697857: I need to find the mileage when a truck is travelling at 65 miles per hour. I know that the truck is traveling 260 miles and gets 7 miles to the gallon. For each mile per hour increase in speed, the truck loses a teth of a mile per gallon in its mileage. This is a part of a huge problem, but I just need help on how to solve this part. \n" ); document.write( "

Algebra.Com's Answer #430315 by josmiceli(19441) $\"\"$ $\"About$

You can put this solution on YOUR website!
This looks like a linear relation between milage, $\"+m+\"$
\n" ); document.write( "and speed. They give you a point, ( s[1] , 7 )
\n" ); document.write( "if you plot milage on the vertical axis and miles driven
\n" ); document.write( "on the horizontal axis. They are also giving you the
\n" ); document.write( "slope of the line. Slope = $\"+-.1+%2F+1+\"$
\n" ); document.write( "But you didn't give me a speed, $\"+s%5B1%5D+\"$ when the milage
\n" ); document.write( "is $\"+7+\"$ miles/gallon.
\n" ); document.write( "If $\"+s%5B1%5D+\"$ is given, I can set up a point-slope formula:
\n" ); document.write( " $\"+%28+m+-+7+%29+%2F+%28+s+-+s%5B1%5D+%29+=+-.1%2F1+\"$
\n" ); document.write( "This would give you the equation
\n" ); document.write( " $\"+m+-+7+=+%28-1%2F10%29%2A%28+s+-+s%5B1%5D+%29+\"$
\n" ); document.write( " $\"+10m+-+7+=+-s+%2B+s%5B1%5D+\"$
\n" ); document.write( " $\"+10m+=+-s+%2B+s%5B1%5D+%2B+7+\"$
\n" ); document.write( " $\"+m+=+%28-1%2F10%29%2As+%2B+%28+s%5B1%5D+%2B+7+%29+%2F+10+%29+\"$
\n" ); document.write( "----------------------------------
\n" ); document.write( "Like I said, you need $\"+s%5B1%5D+\"$ , the speed at which
\n" ); document.write( "the milage is $\"+7+\"$ mi/gal\r
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