Problem

Interpret point \((7,42)\) on a graph whose \(x\text{-}\text{axis}\) is gasoline purchased in gallons and \(y\text{-}\text{axis}\) is total cost in dollars. Identify the input, output, units, and contextual reading.

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input = gasoline purchased, 7 gallons; output = total cost, 42 dollars; reading = 7 gallons of gasoline cost 42 dollars in total

input = gasoline purchased, 42 gallons; output = total cost, 7 dollars; reading = 42 gallons of gasoline cost 7 dollars in total

input = total cost, 42 dollars; output = gasoline purchased, 7 gallons; reading = 42 dollars corresponds to an output of 7 gallons

input = gasoline purchased, 7 dollars; output = total cost, 42 gallons; reading = 7 dollars of gasoline produce a total cost of 42 gallons

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