Question

What is the solution of the system of equations?
-3x-4y-3z=-7
2x-6y+2z=3
5x-2y+5z=9

(5, –2, 7)
(–5, 2, 7)
(5, 2, –7)
no solution

i think i could do it if someone explained it to me, but im terribly confused

Answer 1

Here is a video showing a way to do it
http://www.khanacademy.org/math/linear-algebra/v/solving-3-equations-with-3-unknowns