Definition Of Elimination Method

Elimination Method is the process of eliminating one of the variables in a system of equations using addition or subtraction in conjunction with multiplication or division and solving the system of equations.

Video Examples: Algebra - Solving Systems of Equations - Elimination Method
 

Solved Example on Elimination Method

Ques: Using the elimination method, solve the system of equations.
2x - y + 3z = 9
x + y + z = 6
x - y + z = 2

Choices:

A. (2, 1, -1)
B. (4, 1, 1)
C. (1, -1, 2)
D. (1, 2, 3)
Correct Answer: D

Solution:

Step 1:  [Add the first two equations to eliminate y.]
Step 2: [Add the second and third equations to eliminate y.]
Step 3: We now have a system of two equations in two variables:  
Step 4:  [Multiply the second equation with - 2 and add, and then solve for x.]
Step 5: So, 3x + 4z = 15 gives z = 3 [Substitute the values.] 
Step 6: x + y + z = 6 gives y = 2 [Substitute the values.]
Step 7: So, the solution is (1, 2, 3).

Related Worksheet

• Solving-Systems-of-Equations-by-Elimination-Method-Gr-8