got this equation ( just started with this )



6y+x+3z = 3
y + x + z = -2
4y + x+ z = 7

using -6 and -4 on top / bottom equation to remove y parts

y+x+z = -2
-5x - 3z = 15
-3x - 3z = 15

using 5 and -3 to remove x in the two last equations
gives me

y + x + z = -2
-6z = 30

y + x + z = -2
z = -5

I don't know where to go from here, would love some help.

This is the way the teacher does it and I don't konw any other way.

the short way is to input this into a graphing calculator and rref it

But by hand, always try and use the elementary row operations:
1) they are interchangable
2) you can multiply a row by a scalar
3) you can add 1 row to another row



hope this helps


E: forgot to rotate image, just tilt your head to read!

This post was edited by TritonV8 on Apr 7 2013 08:38am

Thanks alot, really helped me out!