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 first equation.

x + 6y + z = 2
x – 3y + 2z = –1
x + 5y + 3z = –4

A. 11y + 4z = 6
2y + 5z = 3

B. 3y + 3z = –3
11y + 4z = –6

C. y – 2z = 6
–8y – z = 3

D. –9y + z = –3
–y + 2z = –6

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 first equation.

x + 6y + z = 2
x – 3y + 2z = –1
x + 5y + 3z = –4

A. 11y + 4z = 6
     2y + 5z = 3
		
B. 3y + 3z = –3
    11y + 4z = –6
		
C. y – 2z = 6
    –8y – z = 3
		
D.  –9y + z = –3
      –y + 2z = –6

anonymous · Answer

If you solve for x in (1) you get x=2-z-6y.  If your then substitute that equation for x in (2) and (3) and simplify, you get system D.

anonymous · Answer

thanks