The Student
Junior Member
- Joined
- Apr 25, 2012
- Messages
- 241
In the following system of equations, I am confused with how we can know that z is the free variable and not y. I know that in this example it is obviously z, but I can't figure a general rule.
x + 3y + z = −1
3y + 4z = 1
0y + 0z = 0
x + 3y + z = −1
3y + 4z = 1
0y + 0z = 0