Inverse transformation for linear transformations

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SUMMARY

The discussion focuses on finding the inverse transformations for given linear transformations T(s,t). Specifically, it addresses four cases: (a) T(s,t) = (3s+t, s-2t), (b) T(s,t) = (s^3, s+t), (c) T(s,t) = (t, s), and (d) T(s,t) = (e^t, s). The linear transformations in cases (a) and (c) can be represented by matrices, allowing for straightforward computation of their inverses. In contrast, cases (b) and (d) are nonlinear, requiring a descriptive approach to understand their inverse transformations.

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Homework Statement


Find the inverse transformation T-1(x, y) in each case below:

(a) T(s,t) = (3s+t, s-2t)
(b) T(s,t) = (s3, s+t)
(c) T(s,t) = (t, s)
(d) T(s,t) = (et, s)



The Attempt at a Solution


I'm not completely sure what this is asking. What is an inverse transformation? I'm sure it's really basic, I just can't find an explanation online. The only examples I can find have one variable. So I can't really get anywhere on this.
 
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A transformation is a kind of function. Instead of mapping one number to another as ordinary functions do, it maps a vector to some other vector, possibly in a different vector space.

For example, if s = 2 and t = 1, the transformation in part a maps the vector <2, 1> to the vector <7, 0>. The inverse transformation, T-1 would map <7, 0> back to <2, 1>.

If a transformation is linear (as a and c are), there is a matrix that represents the transformation. The ones in b and d are nonlinear, so "finding the inverse transformation" might involve only describing what the inverse transformation needs to do.
 
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