# Thread: Exonential Equations

1. ## Exonential Equations

If Y = Ae^-kt

and Y = 19.6 when T = 2
and Y = 19.02 when T = 5

Find the value of the constants A and k

2. Hello,

Just replace it in the equation...

$19.6=Ae^{-2k}$
$19.02=Ae^{-5k}$

Then, you can divide the equations term by term

-> $\frac{19.6}{19.02}=\frac{e^{-2k}}{e^{-5k}}=e^{-2k+5k}=e^{3k}$

Can you continue ?