Got Homework?
Connect with other students for help. It's a free community.
Here's the question you clicked on:
 0 viewing

This Question is Closed

gjhfdfgBest ResponseYou've already chosen the best response.0
I have absolutely know idea how to solve this problem using it, 3x  2y + 2z  w = 2 4x + y + z + 6w = 8 3x + 2y  2z + w = 5 5x + 3z  2w = 1 Wants me to find the solution
 one year ago

gjhfdfgBest ResponseYou've already chosen the best response.0
I mean no instead of know. *face palm*
 one year ago

tyteen4a03Best ResponseYou've already chosen the best response.1
The matrix version or the simple "moving variables around" version?
 one year ago

gjhfdfgBest ResponseYou've already chosen the best response.0
I believe its the 'simple' moving variables around version
 one year ago

tyteen4a03Best ResponseYou've already chosen the best response.1
I just threw this into WolframAlpha, and it didn't give me any value results. Do you need value results?
 one year ago

gjhfdfgBest ResponseYou've already chosen the best response.0
Nope, it says find the solution or state that none exists./ So I guess there isnt a solution
 one year ago

tyteen4a03Best ResponseYou've already chosen the best response.1
Oh, then I'll show you why there isn't one then. When doing the simple version of Gaussian elimination, always look for "bare" variables first (variables that has a coefficient of 1, otherwise known as "that variable with no numbers"). In this case: 3x  2y + 2z  w = 2 (1) 4x + y + z + 6w = 8 (2) 3x + 2y  2z + w = 5 (3) 5x + 3z  2w = 1 (4) In this case, we notice that in Equation 1 and 3, both w are bare (although there's a minus sign before the w in Eq. 1). Shift w around in Eq. 1 to make it positive again. Now change the subject: 3x  2y + 2z  w = 2 becomes w = 3x  2y + 2z  2 and 3x + 2y  2z + w = 5 becomes w = 5 + 3x  2y + 2z. Now that w is (sort of) found, hook them together: 3x  2y + 2z  2 = 5 + 3x  2y + 2z. You see that after simplifying you're left with 2 = 5, which is obviously impossible. Therefore, there is no solution since two of the socalled "related equations" contradict each other.
 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.