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## Homework Statement

A is a 4 x 5 matrix equal to

[1 4 -1 5 3

3 7 -2 9 6

-2 -3 6 -4 1

1 6 9 8 2]

and b =

[5

40

15

12]

(b is 4 x 1)

Find the LU factorization and use it to solve Ax = b

## Homework Equations

## The Attempt at a Solution

I set Ly = b, and solve for y, then I set Ux = y, and when I row-reduce the Augmented [U y] matrix, I always get a 4 x 1 matrix, but x is supposed to be 5 x 1, what am I doing wrong??