Determine Which of the Following Systems of Equations Is in Row-Echelon

question 94

Multiple Choice

Determine which of the following systems of equations is in row-echelon form. System I: $\left\{ \begin{aligned}x - 8 y + 6 z & = 2 \\y - 7 z & = - 19 \\z & = 17\end{aligned} \right.$ System II: $$\left\{ \begin{aligned}x - 6 y - 8 z & = 2 \\2 y + 5 z & = - 1 \\z & = - 3\end{aligned} \right.$$ System III: $$\left\{ \begin{aligned}x - 4 y - z & = 20 \\y + 3 z & = 14 \\z & = 9\end{aligned} \right.$$

• A)None of the systems are in row-echelon form.
• B)Only system I is in row-echelon form.
• C)Only systems I and III are in row-echelon form.
• D)Only systems I and II are in row-echelon form.
• E)Only systems II and III are in row-echelon form.

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Definitions:

Radius

One of the two major bones in the forearm, located on the lateral side (thumb side) of the forearm.

Distal Location

Refers to parts of the body or structures located farthest from the point of attachment or reference.

Humerus

The long bone in the upper arm that runs from the shoulder to the elbow.

False Ribs

The lower ribs (usually ribs 8-10) that are not directly attached to the sternum but are connected to the true ribs above them via cartilage.