Eliminate the “z” variable in the last two equations by finding opposite coefficients and adding. What is the resulting equation?

x + 3y + 2z = –16
2x – y + 2z = –15
2x – 2y – z = 1
Answer
6x – 5y = –13
4x + y = –14
4x – 3y = –14
6x + 5y = 13
.

Question

Eliminate the “z” variable in the last two equations by finding opposite coefficients and adding. What is the resulting equation?

x + 3y + 2z = –16
2x – y + 2z = –15
2x – 2y – z = 1
Answer    
6x – 5y = –13 
   4x + y = –14 
   4x – 3y = –14 
   6x + 5y = 13 
.

anonymous · Answer

2x-y+2z=-15
2(2x-2y-z)=2(1)

2x-y+2z=-15
4x-4y-2z=2
add together
6x-5y=13

anonymous · Answer

6x-5y=-13*

hero · Answer

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