Practice!

Sample Problem

Solve the system by elimination:

2x + 2y +2z = 6

6x + 6y + 6z = 13

2x – y + 3z = 16

Enter your solution in the form ( x , y , z ). Enter “N” for all three variables if there is no solution. Enter “I” for all three variables if there are an infinite number of solutions.

( , , )

Solution

6x + 6y + 6z = 13

- 6x + 6y + 6z = 18 (equation 1 multiplied by 3)

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0  -5

There are no solutions to this system.