SOLUTION: 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 incr

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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.
Answer by josmiceli(19441) (Show Source):
You can put this solution on YOUR website!
This looks like a linear relation between milage,
and speed. They give you a point, ( s[1] , 7 )
if you plot milage on the vertical axis and miles driven
on the horizontal axis. They are also giving you the
slope of the line. Slope =
But you didn't give me a speed, when the milage
is miles/gallon.
If is given, I can set up a point-slope formula:

This would give you the equation

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Like I said, you need , the speed at which
the milage is mi/gal