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Find the linear transformation matrix

  1. Oct 6, 2011 #1
    1. The problem statement, all variables and given/known data
    Suppose that a linear transformation maps a point (2,3) to (0,1) and maps a point (9,7) to (1,0). Find the matrix for this linear transformation.

    2. Solution (answersheet)
    Observe that the two point that are the result of the mapping are the two base vectors.
    If our information would be that (0,1) were mapped to (2,3) and that (1,0) were mapped to (9,7), then the matrix would be easy to write down.
    |9, 2|
    |7, 3|
    But we are in the opposite direction! so the answer is the inverted matrix.

    3. My question
    How would this question be solved if the points wouldn't map to the base vectors? I.o.w. what are the common steps to solve this, that are skipped here? If possible. The only way I know is with homogeneous coordinates, but I couldn't get it to work with this exercise.
    Last edited: Oct 7, 2011
  2. jcsd
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