- #1

- 528

- 33

l-cm-bn=0

-cl+m-an=0

-bl-am+n=0

In my textbook, its written "eliminating l, m, n we get:"

$$

\begin{vmatrix}

1& -c& -b\\

-c& 1& -a\\

-b& -a& 1\\

\end{vmatrix}=0

$$

but if I take l, m, n as variables and since ##l=\frac{\Delta_1}{\Delta}## (Cramer's rule) and ##\Delta_1=0##, then if ##\Delta=0##,you get an indeterminate form.

Is the expression given in my textbook correct?