Solving Linear Systems Lecture 2: Row Operations and Gaussian Elimination

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Questions and Answers

In the context of identifying echelon forms, which characteristic is used to identify a matrix as being in row echelon form (REF)?

  • Zero rows
  • Leading ones
  • Staircase (correct)
  • Columns with leading ones

When identifying a matrix as in reduced row echelon form (RREF), which characteristic is important?

  • Columns with leading ones
  • Staircase
  • Leading ones (correct)
  • Zero rows

Which of the following is a characteristic used to identify a matrix as neither in REF nor RREF?

  • Zero rows (correct)
  • Staircase
  • Leading ones
  • Columns with leading ones

What characteristic is used to determine if a matrix has columns with leading ones?

<p>Columns with leading ones (D)</p>
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When identifying a matrix as neither in REF nor RREF, which characteristic is important?

<p>Zero rows (B)</p>
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Match the following identifiers with their corresponding echelon form:

<p>Example 1 = REF Example 2 = RREF Example 3 = neither Example 4 = N/A</p>
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When performing matrix addition, which of the following properties holds true?

<p>Commutative: $A + B = B + A$ (C)</p>
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Which property of scalar multiplication is demonstrated by the equation $r(A + B) = rA + rB$?

<p>Distributive property (A)</p>
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If matrix $A$ has dimensions $m \times n$, what are the dimensions of the zero matrix $O$?

<p>$m \times n$ (C)</p>
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Which property is illustrated by the equation $r(sA) = (rs)A$ in scalar multiplication?

<p>Associative property (C)</p>
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For any matrix $A$, what is the result of the operation $A - A$?

<p>$O$, where $O$ is the zero matrix (B)</p>
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