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.

3x + y + 2z = 1
x + 2y – z = –8
3x – y – 3z = 18

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.

3x + y + 2z = 1
x + 2y – z = –8
3x – y – 3z = 18

anonymous · Answer

I dont understand what I am supposed to do?  Do I use the substitution method?  Do I isolate the second equation?

anonymous · Answer

So I am just supposed to isolate x?

hero · Answer

Yup

anonymous · Answer

Thank You!

hero · Answer

Well, actually, that's the first step. You still have to substitute the expression for x into the other equations to get the "new" systems of equations.