Let f: R → a. f(x + y) = > R³ be defined by f(x) = (4x, 8x, −7x). Is f a linear transformation? f(x) + f(y) = + Does f(x + y) = f(x) + f(y) for all x, y ER? choose b. f(cx) = c(f(x)) = Does f(cx) = c(f(x)) for all c, x € R? choose c. Is f a linear transformation? choose

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