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

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

y – 2z = 6
–8y – z = 3

3y + 3z = –3
11y + 4z = –6

–9y + z = –3
–y + 2z = –6

Answer 1

x=-6y-z+2

sub into x in each equation

x – 3y + 2z = –1
x + 5y + 3z = –4

these will go to

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

these simplify too
–9y + z = –3
–y + 2z = –6

Answer 2

thanks