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 + 0y = -16

D)-5x +5y = -8
-4x + 18z = -10

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
 	
	
A)-11y + 5z = 21
y + 9z = 9
	
B)5y - 7z = 21
17y - 3z = 9
	
C)7x - 13y = -14
8x + 0y = -16
	
D)-5x +5y = -8
-4x + 18z = -10

anonymous · Answer

I explained in good detail in the last problem we did how to do something similar. If you have any questions and no one helps, please tag my name and I will walk you through this @kellyconnelly.

anonymous · Answer

from second eq 
we have x = 4y -3z -11 and replace x  in the first and the third

anonymous · Answer

see if you get 
B)5y - 7z = 21

 17y - 3z = 9

anonymous · Answer

Remember to use parentheses when plugging in/substituting (4y - 3z - 11) for x