Use Back-Substitution to Solve the System of Linear Equations $\left\{ \begin{array} { c c c } 4 x - 3 y - 2 z & = & 21 \\6 y - 5 z & = & 5 \\z & = & - 7\end{array} \right.$

question 89

Multiple Choice

Use back-substitution to solve the system of linear equations. $\left\{ \begin{array} { c c c } 4 x - 3 y - 2 z & = & 21 \\6 y - 5 z & = & 5 \\z & = & - 7\end{array} \right.$

• A) \(( - 2 , - 5 , - 7 )\)
• B) \(( - 2,5,7 )\)
• C) \(( - 5,7 , - 2 )\)
• D) \(( - 2 , - 5,7 )\)
• E) \(( - 5 , - 7 , - 2 )\)

---

Definitions:

Printer

A peripheral used to output text and/or graphics onto paper.

Laser Printer

A type of printer that produces output using an imaging process similar to a copier. Laser printers are the most expensive type of printer.

Interfaces

Points of interaction between different systems or components, allowing them to communicate or work together.

PC

A personal computer, commonly abbreviated as PC, is a multi-purpose electronic device designed for individual use, capable of executing commands and performing computational tasks.