1. The problem statement, all variables and given/known data Find a,b,c,z 2a+b+2c=z a+2b+c=4 a+b+2c=3 2. The attempt at a solution Ok so i've tried multiplying all lines by 2 so you may possibly cancel out 2a, but not sure where to go after i multiplied everything. Then i tried to just cancel one equation and then another one e.g 4a+5b+4c=10 4a+4b+8c=12 B-4c=-2 But not sure. I would really like an explanation on how to actually do it rather than the answer.