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</p> Signup and view all the answers

    When identifying a matrix as neither in REF nor RREF, which characteristic is important?

    <p>Zero rows</p> Signup and view all the answers

    Match the following identifiers with their corresponding echelon form:

    <p>Example 1 = REF Example 2 = RREF Example 3 = neither Example 4 = N/A</p> Signup and view all the answers

    When performing matrix addition, which of the following properties holds true?

    <p>Commutative: $A + B = B + A$</p> Signup and view all the answers

    Which property of scalar multiplication is demonstrated by the equation $r(A + B) = rA + rB$?

    <p>Distributive property</p> Signup and view all the answers

    If matrix $A$ has dimensions $m \times n$, what are the dimensions of the zero matrix $O$?

    <p>$m \times n$</p> Signup and view all the answers

    Which property is illustrated by the equation $r(sA) = (rs)A$ in scalar multiplication?

    <p>Associative property</p> Signup and view all the answers

    For any matrix $A$, what is the result of the operation $A - A$?

    <p>$O$, where $O$ is the zero matrix</p> Signup and view all the answers

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