Find the matrix A in the linear transformation y = Ax, where x = [x 1 x

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Find the matrix A in the linear transformation y = Ax, where x = [x1    x2]T (x = [x1    x2    x3]T) are Cartesian coordinates. Find the eigenvalues and eigenvectors and explain their geometric meaning.

Reflection about the x1-axis in R2.

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