Help, please? ^^

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

a. -11y + 5z = 21
y + 9z = 9

b. 5y - 7z = 21
17y - 3z = 9

c. 7x - 13y = -14
8x = -16

d. -5x +5y = -8
-4x + 18z = -10

Question

Help, please? ^^

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

a. -11y + 5z = 21
y + 9z = 9 
	
b. 5y - 7z = 21
17y - 3z = 9 
	
c. 7x - 13y = -14
8x = -16

d. -5x +5y = -8
-4x + 18z = -10

radar · Answer

I like b.

radar · Answer

but I admit I only check the first equation.

anonymous · Answer

B checked it twice. ANSWER is B

anonymous · Answer

Thanks so much, guys!