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    Calculus 2 - For which value(s) of "a" and "b" will the system of equations...?

    2x+y+3z=13, x+y+z=6, -x+y+az=b have i) no solution ii) one solution iii) infinitely many solutions. Give the solution set in this case. Thanks a lot.
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    Calculus 2 - Let us rotate the vectors of R^2 by an angle of -pi/2. What is the ...?

    matrix of the transformation in the basis of i and j (unit vectors). What is the rank of this matrix? Thanks a lot.
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