Question

Solve the following system using matrices.
4a-3b+5c=2
2a+4b-7c=20
a-3b+8c=-13

Answer 1

use rref of \[\left[\begin{matrix} 4 & -3 &5 &2 \\ 2 & 4 & -7 & 20 \\ 1 &-3 & 8& -13\end{matrix}\right]\]

Answer 2

don't you use that and then take out the very right column and use the diagonal way..?

Answer 3

you can use that manually method of you want. I'm more used to to row operations to deal with matrices.

Answer 4

how do you do that?

Answer 5

are you talking about gaussian elimination?

Answer 6

i don't know what the actual name is called

Answer 7

row operations ( http://en.wikipedia.org/wiki/Row_operations )

Answer 8

given matrices Ax = b

reducing A into row echelon form or reduced row echelon form?

Answer 9

ya, that's it

Answer 10

is that the method you are asked to use?

Answer 11

the question posted said "Solve the following system using matrices" so i would think either way works.

Answer 12

no we learned something completely different

Answer 13

but i didn't understand it