Determine Whether the Matrix Is in Row-Echelon Form $$\left[ \begin{array} { c c c c } 1 & - 9 & 5 & 2 \\0 & 1 & 0 & - 9 \\0 & 0 & 1 & - 5\end{array} \right]$$

question 72

Multiple Choice

Determine whether the matrix is in row-echelon form. If it is, determine if it is also in reduced row-echelon form. $$\left[ \begin{array} { c c c c } 1 & - 9 & 5 & 2 \\0 & 1 & 0 & - 9 \\0 & 0 & 1 & - 5\end{array} \right]$$

• A)row-echelon form
• B)row-echelon form and reduced row-echelon form
• C)neither

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