# Help write the vector b as a linear combination of the columns of the matrix (Linear Alg)

**Question description**

Please help write the vector b = [ 1 2 3 ] as a linear combination of the columns of the matrix

A = [ 1 2 3 4 ]

......[ 5 6 7 8 ]

.....[ 9 10 10 12 ]

b = [ 1 2 3 ] should actually is displayed top to bottom, so

b = [ 1 ]

......[ 2 ]

......[ 3 ]

Please ignore the dots. They are there just to aligned the rows up.

Please show steps so that I can learn. Thank you.

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