A linear transformation T : R2 → R2 is called a dilation if T(x) = rx for r > 1. (It is called a contraction if 0 < r < 1.) (a) Find the matrix A such that T(x) = Ax. A = 1 0 0 1 Incorrect: Your answer is incorrect. (b) Let r = 3, and then sketch the graphs of u = 5 −1 and T(u).