SOLUTION: x-y+2z=-7 y+z=1 x=2y+3z I did start this problem but got stuck fairly quickly. We're supposed to be solving using substitution or elimination. Please get back to me as soon as

Algebra ->  Coordinate Systems and Linear Equations  -> Lessons  -> Linear Equations Lesson -> SOLUTION: x-y+2z=-7 y+z=1 x=2y+3z I did start this problem but got stuck fairly quickly. We're supposed to be solving using substitution or elimination. Please get back to me as soon as      Log On


   

Question 989648: x-y+2z=-7
y+z=1
x=2y+3z
I did start this problem but got stuck fairly quickly. We're supposed to be solving using substitution or elimination. Please get back to me as soon as possible, thanks!
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
x-y+2z=-7
y+z=1
x=2y+3z
==============
Sub for x in the 1st eqn.
(2y + 3z) - y + 2z = 7
y + 4z = 7
y + z = 1
=================== Subtract
3z = 6
z = 2 *******************
------
y + z = 1
y = -1 **********************
------
Sub for y & z anywhere to find x.