An Augmented Matrix That Represents a System of Linear Equations

question 7

Multiple Choice

An augmented matrix that represents a system of linear equations (in variables x,y,z and w if applicable) has been reduced using Gauss-Jordan elimination.Find the solution represented by the augmented matrix.​ $\left[\begin{array}{l}{\begin{array}{cccc}1 & 0 & 0 & \vdots-3\end{array}} \\\begin{array}{llll}0 & 1 & 0 & \vdots-9\end{array} \\\begin{array}{llll}0 & 0 & 1 & \vdots3\end{array} \\\end{array}\right]$ ​

• A)​(-3,9,3)
• B)(3,-9,3)
• C)(-3,-9,3)
• D)(-3,-9,-3)
• E)(-3,3,-9)

---

Definitions:

Longitudinal Method

A research design in which the same individuals are observed or tested repeatedly over a period of time.

Free-Radical Theory

An idea that posits the aging process in organisms is a result of cells accumulating damage from free radicals over time.

Unstable Oxygen Molecules

Often referred to as free radicals, these are molecules with unpaired electrons that can cause oxidative damage to cells and tissues.

Empiricism

Empiricism is a theory that states that knowledge comes only or primarily from sensory experience.