1. Solve Systems of Linear Equations in Three Variables
SECTION 3.4
Solve Systems of Linear Equations in Three Variables

2. California Standard:
2.0: Students solve a system of two linear equations in two variables algebraically and are able to interpret the answer graphically. Students are able to solve a system of two linear inequalities in two variables and to sketch the solutions sets.

3. OBJECTIVE(S): By following instructions, students will be able to:
Solve systems of linear equations in three variables.

4. Def: A linear equation in three variables x, y, and z is an equation of the form where a, b, and c are not all zero. Def: A solution of a system of linear equations in three variables is an ordered triple.

6. EXAMPLE 1:
Solve the system.

7. EXAMPLE 2:
Solve the system.

8. EXAMPLE 3:
Solve the system.

9. U-TRY #1:
Graph the system of linear inequalities. a) c) b)

10. HOMEWORK
Sec 3.4 WS