How in the world do I solve linear systems containing three variables?

Question

lgbasallote · Answer

if you know how to do 2, then use systems on the first two, the last two and the first and last. Note: solve for different variables on each combinations. When you've done that, you have three equations in terms of a certain variable. substitute one of these variables to one of the original equations. You will get a value for a variable already. Repeat the last step until you get all the values.

lgbasallote · Answer

it would be better for a demonstration so if you'd like you can post a problem

anonymous · Answer

Yes, I was just about to say that. :) How about 3x+3y+3z = 4
                                                                   2x-y-5z=2
                                                                    5x-2y-2z=6

anonymous · Answer

Everything you said in the first post I've been following for the past one hour, going through my online textbook and everything, but I still can't seem to grasp the aspect of knowing which equation to manipulate first, etc etc.