The percentage of alcohol in a person's bloodstream t hr after drinking 8 fluid oz of whiskey is given by
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The y's value is given in the first equation. 
. Now to solve, we will, plug it's value in the second equation.
Now we have x's value, we will plug it's value in the first equation.(We can plug it in the second one too, but plugging it the first one will make it easier.)
Now we have x's value, we will plug it's value in the first equation.(We can plug it in the second one too, but plugging it the first one will make it easier.)