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## Homework Statement

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?

## Homework Equations

## 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.