In Exercises 25-28, determine if the specified linear transformation is (a) one-to-one and (b) onto. Justify each answer.
27. The transformation in Exercise 19
In Exercises 17-20, show that T is a linear transformation by finding a matrix that implements the mapping. Note that x1, x2,... are not
19. T(x1, x2, x3) = (x1 − 5x2 + 4x3, x2 – 6x3)
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