Use the substitution method to solve the following system of equations.

3x + y – z = 2
2x + y + 2z = 8
2x – 3y + z = 21

Question

Use the substitution method to solve the following system of equations.

3x + y – z = 2
2x + y + 2z = 8
2x – 3y + z = 21

anonymous · Answer

(3, –4, 3) //
   (–3, 4, 3) //
   (3, 4, 3) //
   (3, 4, –3)

anonymous · Answer

Hi!  Do you want to learn the material?

anonymous · Answer

(Or just get the answer?)

anonymous · Answer

He's doing ther sister homework i suposse he wants the answer

anonymous · Answer

oh.  that makes me sad.

anonymous · Answer

SHE! i am a girl. lol & the work. I have so many problems to go though~ :///

anonymous · Answer

OK.  if you want to do the work then my suggestion for a strategy is:

1) solve the first equation for z
2) solve the second equation for y
3) substitute y and z from the previous steps into the third equation.

Let's try step 1.  What do you get when you solve the first equation for z?