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.

2x – 3y – z = –1
x – 4y + 3z = –11
2x + 9y + 3z = –13
Answer

–5x +5y = –8
–4x + 18z = –10

7x – 13y = –14
8x = –16

–11y + 5z = 21
y + 9z = 9

5y – 7z = 21
17y – 3z = 9

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.

2x – 3y – z = –1
x – 4y + 3z = –11
2x + 9y + 3z = –13
Answer
		
–5x +5y = –8
–4x + 18z = –10
		
7x – 13y = –14
8x = –16
		
–11y + 5z = 21
y + 9z = 9
		
5y – 7z = 21
17y – 3z = 9

turingtest · Answer

the last choice is the correct answer it seems

turingtest · Answer

I just checked up until I saw the "-7z", which only appears in the last choice