CPM Homework Help : PC3 Problem 5-46

Solve for $a$ and $b$ : $\begin{aligned}[t] 42 = ab^6 \\ 15 = ab^9 \end{aligned}$

Method 1:

Divide the second equation into the first equation to eliminate $a$ .

Method 2:

Solve one equation for ' $a$ ' and substitute that expression into the second equation.