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

Answer 1

x = 2 - 6y - z (isolate x)

now sub 2 - 6y - z in for x into the second equation
x - 3y + 2z = -1
2 - 6y - z - 3y + 2z = -1
combine like terms
-9y + z = -3

now sub 2 - 6y - z in for x in your third equation
x + 5y + 3z = -4
2 - 6y - z + 5y + 3z = -4
combine like terms
-y + 2z = -6

Answer 2

thank you so much :D

Answer 3

no problem :)