Math 309 Exam 1: Linear Algebra
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Questions and Answers

What is the solution to the system of linear equations £1—Xo+ x3 =0, 221 —X2 =2, and —32} +223 =1?

  • x1 = -5, x2 = -12, x3 = -7 (correct)
  • x1 = -7, x2 = 12, x3 = 7
  • x1 = 4, x2 = -12, x3 = -7
  • x1 = 20, x2 = -12, x3 = -7
  • What is the value of h such that the matrix is the augmented matrix of a consistent linear system?

  • h = 3/2 (correct)
  • h = 38/2
  • h = 0
  • h can be any real value
  • What is the condition for the vector b to be in the range of the linear transformation T(x) = Ax?

  • The vector b is in the null space of A.
  • The vector b is a scalar multiple of the vector x.
  • The vector b is a linear combination of the columns of A. (correct)
  • The vector b is a linear transformation of the vector x.
  • What is the solution to the vector equation 2x + 2y - 3z = 1, x - 2y + z = -3, and x + y - z = 2?

    <p>x = 3/2, y = -1/2</p> Signup and view all the answers

    Suppose T : R² → R³ is a linear transformation. If T(u) = [1, 2, 3] and T(v) = [4, 5, 6], what is T(2u - v)?

    <p>[-2, -3, -4]</p> Signup and view all the answers

    What is the standard matrix of the linear transformation T that maps e₁ to e₁ + e₂ and e₂ to e₂ - 2e₁?

    <p>[[1, 1], [1, -2]]</p> Signup and view all the answers

    What is the description of the entire solution set to Ax = 0?

    <p>x = t[1] + s[-1] + r[1]</p> Signup and view all the answers

    Is the set of vectors { [|1], [|2], [|3] } linearly independent?

    <p>linearly dependent</p> Signup and view all the answers

    Is the linear transformation T(x) = [| -2x₁ + x₂, x₁ + 3x₂ |] one-to-one and/or onto?

    <p>It is one-to-one but not onto.</p> Signup and view all the answers

    Let T : R³ → R² be a linear transformation with standard matrix A. If Ax = b has a solution for every b in R², what can be said about the matrix A?

    <p>The matrix A is onto.</p> Signup and view all the answers

    What is the inverse of the matrix A if the solution set to Ax = b is described as x = t[1] + 4s[1] + r[-1]?

    <p>A^(-1) = [1 4 -1]</p> Signup and view all the answers

    Let T : R² → R² be a linear transformation with standard matrix A. If T is invertible, what can be said about the matrix A?

    <p>The matrix A is invertible.</p> Signup and view all the answers

    If an m x n matrix has m pivot columns, what can be said about the linear transformation T(x) = Ax?

    <p>It is a one-to-one mapping.</p> Signup and view all the answers

    If A is an m x n matrix and the equation Ax = b is consistent for some b, what can be concluded about the columns of A?

    <p>The columns of A span R^n.</p> Signup and view all the answers

    If an n x n matrix has n pivot positions, what can be said about the reduced echelon form of A?

    <p>The reduced echelon form of A is an identity matrix.</p> Signup and view all the answers

    If A and B are m x n matrices, what can be said about the matrices AB^T and A^TB?

    <p>Both AB^T and A^TB are defined.</p> Signup and view all the answers

    If A is invertible and r ≠ 0, what can be said about the inverse of (rA)?

    <p>The inverse of (rA) is (1/r)A^(-1).</p> Signup and view all the answers

    If AB = AC where B and C are n x p matrices, and A is an invertible n x n matrix, what can be concluded about B and C?

    <p>B = C.</p> Signup and view all the answers

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