An infinite geometric series has a common ratio $r$ such that $|r| < 1$. The sum of the odd-indexed terms ($a_1 + a_3 + a_5 + \dots$) is $9$, and the sum of the even-indexed terms ($a_2 + a_4 + a_6 + \dots$) is $3$. What are the values of the first term $a_1$ and the common ratio $r$?