$\displaystyle \begin{cases} ad = 1 \\ ae+bd = -6 \\ af+be+dc = 15 \\bf+ec = -18 \\cf = -7\end{cases}$
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Originally Posted by PQR $\displaystyle \begin{cases} ad = 1 \\ ae+bd = -6 \\ af+be+dc = 15 \\bf+ec = -18 \\cf = -7\end{cases}$ You have 5 equations in 6 variables. You can't expect to solve for numerical values of all 6. But you can try to solve for 5 of those variables in terms of the sixth one.
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