Solve the System by Using the Inverse of the Coefficient $$\begin{array} { c } 3 x - y - 9 z = - 68 \\- 9 x - 3 z = - 30 \\2 y + z = 23\end{array}$$

question 36

Multiple Choice

Solve the system by using the inverse of the coefficient matrix.
- $$\begin{array} { c } 3 x - y - 9 z = - 68 \\- 9 x - 3 z = - 30 \\2 y + z = 23\end{array}$$

• A) \(\{ ( 1,7,8 ) \}\)
• B) \(\varnothing\)
• C) \(\{ ( 1,8,7 ) \}\)
• D) \(\{ ( - 1,8,2 ) \}\)

---

Definitions:

Letter Reports

Brief, informal reports typically addressed to individuals or small groups within an organization.

Transmittal Message

A communication, often accompanying a document or report, that provides the recipient with context or relevant details about the content being sent.

Routine Operational Reports

These are recurring reports prepared and disseminated at regular intervals to keep stakeholders informed about an organization's day-to-day operations.

Appended Parts

Components or sections added to a document or piece of writing.