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Yes, i transposed A^t= |dw:1374263685200:dw|

Looks good, so now I would multiply this matrix by the original a matrix.

the problem i have is knowing which number to multiply with which and also last at c

A good rule of thumb is to multiply scalars at the end. The scalars in this case are -5 and 6

i swapped the negatives on the 2's. sorry about that

oh okay. so basically I multiply.. row and columns?

Sort of. Matrix multiplication works like this:
|dw:1374264402007:dw|

do you understand what you have to do?

after?
not really

Just do what you did to get 29, exception this time multiply the first row by the second column