Sigh! There should really be some quality control on Cody, to save us from stupid problems like this...
The third element of aVec in the the image contained within your problem description does not match the third element of aVec used in the test suite.
Tell me the slope
Back to basics 15 - Benchmark
Sum the numbers on the main diagonal
02 - Vector Variables 3
03 - Matrix Variables 3
05 - Vector Equations 3
07 - Common functions and indexing 1
02 - Vector Variables 4
07 - Common functions and indexing 5
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