1. The problem statement, all variables and given/known data I need to quickly be able to solve something like this: A + B + C = -3 6A + 3B + C = -4 8A - 4B - 2C = 22 My calculus prof set some things to zero and was able to solve it really fast that way. He didn't use matrices. I can't figure out now what he did... can anyone help? 2. Relevant equations 3. The attempt at a solution I think he was making each of the variables 0 at one point, but I tried that and it definitely didn't work, haha.