If you were to use the substitution method to solve the following system, choose the new system of equations that would result if x was isolated in the second equation.

3x – 5y + z = 12
x + 6y – z = –4
2x – 5y – 2z = –8

A) 4x + y = 8
–17y = 0

B) 2x – 11y = 16
4x + 7y = –16

C) –23y + 4z = 24
–17y = 0

D) 13y – 2z = 24
7y – 4z = 0

Question

If you were to use the substitution method to solve the following system, choose the new system of equations that would result if x was isolated in the second equation. 

3x – 5y + z = 12 
x + 6y – z = –4 
2x – 5y – 2z = –8 

A) 4x + y = 8 
    –17y = 0 

B)  2x – 11y = 16 
    4x + 7y = –16 

C)  –23y + 4z = 24 
     –17y = 0 

 D) 13y – 2z = 24 
      7y – 4z = 0

anonymous · Answer

What do you get if you find x in second equation??

anonymous · Answer

I get x=-6y+z-4

anonymous · Answer

Now plug this value in first and third equation separately and tell me what you got..

anonymous · Answer

I got -23y+4z=24 & -17y=0 which means it's C. :) Tyvm @waterineyes Never realized the question was so easy! :)

anonymous · Answer

Welcome dear..

And here is one medal for you because the question is only solved by you..

anonymous · Answer

Ty @waterineyes

anonymous · Answer

$\huge \checkmark $