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Using matrices to solve systems of linear equations.

Hello,

Could someone please tell me how to solve exercises 11, 22 and 26?

__Exercise 11__

The answer of exercise 11 should be that b is not a linear combination of a1, a2 and a3. I computed the echelon form of the augmented matrix where a1, a2, a3 and b are the columns of the augmented matrix, but I end up with a consistent system, so I don't understand why b is not a linear combination of a1, a2 and a3.

__Exercise 22__

Not even a clue where to start...???

__Exercise 26__

In 26(a) I found that the system is consistent, so b is in W. How do I solve 26(b)?

Thanks for your help!

Lotte