How do you solve the system of equations algebraically #7x+5y+z=0, -x+3y+2z=16, x-6y-z=-18#?
equation (5) by
equation (4) from equation (6) we get
equation (7) by
equation (8) from equation (9) we get
Adding third equation to first one,
Adding 2 times of third one to second one,
Substracting 8 times of