Got Homework?
Connect with other students for help. It's a free community.
Here's the question you clicked on:
 0 viewing
How do you do this linear system?
{3x+y+2z=3
X2y+3z=1
4x8y+12z=7
 one year ago
 one year ago
How do you do this linear system? {3x+y+2z=3 X2y+3z=1 4x8y+12z=7
 one year ago
 one year ago

This Question is Closed

telijahmedBest ResponseYou've already chosen the best response.0
is it matrices or which topic
 one year ago

jim_thompson5910Best ResponseYou've already chosen the best response.0
Look at equation 1 where you see the term 1y or just y isolate that y to get 3x+y+2z=3 y=33x2z
 one year ago

jim_thompson5910Best ResponseYou've already chosen the best response.0
now go to the other 2 equations and replace y with 33x2z
 one year ago

telijahmedBest ResponseYou've already chosen the best response.0
let @jim_thompson5910 take care of that
 one year ago

jim_thompson5910Best ResponseYou've already chosen the best response.0
so equation 2 goes from x2y+3z=1 to x2(33x2z)+3z=1 x6+6x+4z+3z = 1 7x6+7z = 1 7x+7z = 1+6 7x+7z = 7 7(x+z) = 7 7(x+z)/7 = 7/7 x+z = 1
 one year ago

jim_thompson5910Best ResponseYou've already chosen the best response.0
Now focus on Equation 3 4x8y+12z=7 4x8(33x2z)+12z=7 4x24+24x+16z+12z=7 28x24+28z=7 28x+28z=7+24 28x+28z=31
 one year ago

jim_thompson5910Best ResponseYou've already chosen the best response.0
After doing all that, things boil down to these 2 equations x+z = 1 28x+28z=31
 one year ago

jim_thompson5910Best ResponseYou've already chosen the best response.0
use any method to solve that new system of equations for x and z once you have x and z, you can use them both to find y
 one year ago
See more questions >>>
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.