Now use MATLAB to double$-$check your hand calculations. In your script, define a matrix A

and a vector $b,$ and assign them the values you found in Problem $2\mathrm{.}1.$ After independently

defining A and $b,$ you can construct the augmented matrix in MATLAB by concatenating the

matrix and the vector:

A$1$

$($This only works because A and $b$ are the same height and are concatenated using a comma$-$

so they are placed side$-$by$-$side $-$ rather than a semicolon, which would try to concatenate

them vertically.$)$ We will want to use this matrix later so make a copy using the command

Write code in your problem$2.$m script to perform the following tasks:

a$.$ Do the elementary row operations in MatLAB to reduce Ab to its RREF. These steps

should copy the steps you did in Problem $2\mathrm{.}2.$ Only print out the final step.

You don't need to make a function that works for arbitrary matrices, just this one!

Hint: The tools to do this were given to you in Problem $1\mathrm{.}1.$ If you are stuck,

here's how you multiply the first row by $2$ :