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Use the main exponential decay equation:
You can plug in x and y values from your given points into the equation.
First point: a*b^-1=8
Second point: a*b^1=2
Solve for a in first equation then plug it into the second equation.
a/b=8 first equation
a*b=2 second equation
Now plug this back into the second equation to solve for a:
So now plug a and b into the exponential decay equation:
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