Let L : R 2 → R 2 be the linear map given by L(x1, x2) = (x1, 2x1 − x2). Write down the matrix AL of L. Find the determinant det(AL). Is L injective? Is L shape-preserving? What is the area scale factor of L? Does L preserve orientation?

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
Publisher:David Poole
Chapter5: Orthogonality
Section5.5: Applications
Problem 30EQ
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Let L : R 2 → R 2 be the linear map given by L(x1, x2) = (x1, 2x1 − x2). Write down the matrix AL of L. Find the determinant det(AL). Is L injective? Is L shape-preserving? What is the area scale factor of L? Does L preserve orientation?
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