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# review - Linear Algebra Review Problems for First Exam Note...

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Linear Algebra Review Problems for First Exam Note: This practice test is longer than the actual exam–The actual exam will total 100 pts, with roughly the same values as assigned here. Hopefully actually this isn’t too much review. 1. (12 points) Find all solutions to the following system of linear equations 1 2 - 1 2 1 1 7 5 2 x y z = - 3 1 0 2. (10 points) Let V be the set of all 2 × 2 matrices. (a) Explan why V forms a vector space, describe a basis for V, and find dim V . (b) Let S be the set of all matrices a b c d such that a + b + c = 0 and a + d = 0. Show that S is a subspace of V , find its dimension, and find a basis for S . 3. (12 points) (a) Let v 1 , v 2 , ..., v n be a subset of a vector space V . A linear combination of v 1 , v 2 , ..., v n is... (b)Is (1 , 0 , 1 , 2) a linear combination of (2 , 1 , 3 , 0) , (7 , 3 , 1 , - 1) , (0 , 1 , 4 , 3)? 4. (10 points) Let A and B be square matrices of the same size. (a) Find an example where AC = 0 but CA = 0.

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