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In Exercises 25-28, determine if the specified linear transformation is (a) one-to-one and (b) onto. Justify each answer.
25. The transformation in Exercise 17
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
17. T(x1, x2, x3, x4) = (0, x1 + x2, x2 + x3, x3 + x4)
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