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examf

# examf - MAT 242 A 1 1 3 6-1-5-2-4 1 3 0 1(15 Given that A =...

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MAT 242 A 1 1. (15) Given that A = 3 6 - 1 - 5 - 2 - 4 1 3 3 6 - 2 - 4 4 8 - 2 - 6 is row-equivalent to R = 1 2 0 - 2 0 0 1 - 1 0 0 0 0 0 0 0 0 : (a) Find all solutions to the homogeneous system of linear equations A x = 0 . (b) What is the dimension of the solution space of the system in (a)? (c) Find a basis for Col( A ).

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Final Exam 2 2. (16) If A = 1 2 k 4 , find all values of k for which. . . (a) A is invertible. (b) det( A ) = 0. (c) A is row-equivalent to 1 0 0 1 . (d) A x = b has a solution for every b .
MAT 242 A 3 3. (18) If V is a subspace of R 3 , find its dimension. If not, show why not. (a) V = { ( x, y, z ) | xy + yz + zx = 0 } . (b) V = { ( x, y, z ) | x + y + z = 0 } . (c) V = { ( x, y, z ) | x = 0 , y + z = 0 , and y - 2 z = 0 } .

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Final Exam 4 4. (20) Consider the following elements of R 3 : u = 1 2 2 , v = 0 - 1 - 2 , w = 1 1 0 , a = 0 2 4 , b = - 9 1 2 . Given that the matrix A = u v w a b is row-equivalent to R = 1 0 1 0 0 0 1 1 - 2 0 0 0 0 0 1 : (a) Which of these are linearly independent sets? (There may be more or less than one.) { u , v } { v , a } { u , v , w } { u , v , b } { v , w , a , b } (b)
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