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Find the least square solutions x* of the system Ax=b

A=[1 3

2 6]

b=[5

0]

A^tAx=A^tb

So I get down to

[5 15 [x1 [5

15 45] x2] = 15]

so i get [1

0]

The book says the solution is

[1-3s

s]

not sure were that came from

A=[1 3

2 6]

b=[5

0]

A^tAx=A^tb

So I get down to

[5 15 [x1 [5

15 45] x2] = 15]

so i get [1

0]

The book says the solution is

[1-3s

s]

not sure were that came from

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