# Math Help - How would you go about solving simultaneously?

1. ## How would you go about solving simultaneously?

So we know that
and that

Now solve those simultaneously

2. Hello

$
\begin{cases}
85=C\exp(3b) & (1)\\
13=C\exp(5b) & (2)
\end{cases}$

As $\exp(5b)\neq 0$, one can divide (1) by (2) which will give an equation that can be solved for $b$. Then use either (1) or (2) to find the value of $C$.