Question 1179893
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The number of gallons of fuel used on a trip varies directly with the number of miles traveled. 
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v, gallons of fuel
d, distance traveled, miles
k, variation constant


{{{v=kd}}}



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..., a trip of 200 miles required 12 gallons of fuel,
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{{{k=v/d}}}

{{{k=12/200}}}

{{{k=6/100=3/50}}}

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{{{highlight(v=(3/50)d)}}}

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