Solving 3 variable systems of equations by elimination

Lessons

1. Solving Three Variable Systems of Equations by Elimination – (Easy)

   Solve the following system of equations by elimination:

   $x - 4y + z = -12$

   $x + 3y - z = 6$

   $2x - 2y + z = 5$
2. Solving Three Variable Systems of Equations by Elimination – (Medium)

   Solve the following system of equations by elimination:

   $4x - 3y + 2z = 20$

   $-2x - 4y + 3z = 3$

   $x + y - z = 2$
3. Solving Three Variable Systems of Equations by Elimination – (Hard)

   Solve the following system of equations by elimination:

   $x + 4y + 7z = 109$

   $4x - 5y + 4z = -29$

   $5x + y - z = 10$