| Jonathan: this sort of thing is called a parametric curve. If p(t) is the price of gas as a function of time and d(t) is the per capita distance travelled as a function of time, then this is the curve given byx=d(t)y=p(t)If the equations of d(t) and p(t) were simple enough, it might be possible to come up with an implicit equation for the curve (like the equation x^2+y^2=1 is the equation for a circle). That is unlikely to be the case here, but it doesn’t really matter: a lot of information, like the slope of the graph at a given point, can be found just from the parametric equations with a little first-year calculus. <a href="http://www.careyourauto.com/">best affordable auto insurance</a> | | Contact
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