1. The problem statement, all variables and given/known data x+2y+6z=4 -3x+2y-z=-4 4x+2z=16 2. Relevant equations I am having trouble solving this equation since i was absent for notes I would appreciate an attempt to explain the process to me. 3. The attempt at a solution I know the basics but if some one could show me step by step mabey i will get it.