James takes two data points from the weight and feed cost data set to calculate a slope, or average rate of change. A guinea pig weighs $3$ pounds and costs $$3\mathrm{.}50$ per week to feed, while a Chihuahua weighs $4\mathrm{.}8$ pounds and costs $$6\mathrm{.}20$ per week to feed.

Using weight as the explanatory variable, what is the slope of the line between these two points? 

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To calculate the slope of the line between these tw... View the full answer