CPM Homework Help : PC3 Problem 10-58

Solve for $r$ , $s$ , and $t$ :

$\begin{align*}3r + 2s − t = 8\\6r − s + 2t = 2\\r + s = 3\end{align*}$

Hint:

Write the system of equations as a matrix equation.
Use a calculator to solve the system.

More Help:

If $AX = B$ , then $X = A^{−1}B$ .