Mathematics
OpenStudy (anonymous):

I have been looking on the internet, at youtube videos, and on my online school workbook for help but I cannot find it. I really need help with solving this system using an augmented matrix. Please help me to understand how to do this!! The problem is: -x-3y+=-17 and 2x-6y+-26 I so far have the matrix made up. -1 -3 | -17 2 -6 | -26

OpenStudy (math&ing001):

This is how solving by matrix works :

OpenStudy (math&ing001):
OpenStudy (math&ing001):

Sorry missed a few step on the inverse of the matrix, here it is : http://prntscr.com/4ucies

OpenStudy (anonymous):

Thank you for the actual work, this helps, but could you also explain to me how you got those steps? Like what are the steps? Please and thank you. :)

OpenStudy (math&ing001):

I kind of explained that in there with A.X=B, those are general steps. Also, you'll always need to find A^(-1) and multiply it by B to get matrix X that you're looking for.

OpenStudy (math&ing001):

And this is what it will come to in the end : http://prntscr.com/4ucjuo

OpenStudy (math&ing001):

That's X=A^(-1)*B

OpenStudy (math&ing001):

If you're still having difficulties, take a look at this. It's really well explained here : http://www.mathsisfun.com/algebra/systems-linear-equations-matrices.html

OpenStudy (anonymous):

Haha, thank you again, that helps a little more as well.

OpenStudy (math&ing001):

You're much welcome !