A community for students.
Here's the question you clicked on:
 0 viewing
anonymous
 3 years ago
HELP! how to solve system of equations
x2y+z=1
y+2z=4
x+y+3z=5
what do we do when there is a missing variable??? :(
anonymous
 3 years ago
HELP! how to solve system of equations x2y+z=1 y+2z=4 x+y+3z=5 what do we do when there is a missing variable??? :(

This Question is Closed

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0what are you solving for??

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0I'm not sure what to do since the x is missing.

Directrix
 3 years ago
Best ResponseYou've already chosen the best response.1Write the system as: x  2y +z =1 0x +y+ 2z=4 x + y + 3z = 5 In the first and third equations, eliminate the variable x. Then, you will have a system of 2 by 2 equations in the unknowns y and z. Of those two equations, eliminate a variable and solve for the other. If you are allowed to use technology, take a look at the online 3 x 3 linear equation system solver at: http://math.bd.psu.edu/~jpp4/finitemath/3x3solver.html @mathcalculus

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0im trying to solve it step by step

Directrix
 3 years ago
Best ResponseYou've already chosen the best response.1x  2y +z =1 0x +y+ 2z=4 x + y + 3z = 5 x  2y +z =1 x  2y +z =1 x + y + 3z = 5 multiply through by 1 > x  y  3z = 5  3y  2z = 4

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0i got a little lost. now i know why

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0i got that, so what about the second equation?

Directrix
 3 years ago
Best ResponseYou've already chosen the best response.1@mathcalculus Your Task: Solve this system  Just add them. 3y  2z = 4 y+ 2z=4 

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0it bothers me that the 0x is there.

Directrix
 3 years ago
Best ResponseYou've already chosen the best response.1Don't look at it. When I eliminated the "x" in equations #1 and #3, the 0x was not an issue.

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0but it can't be. it's undefined.

Directrix
 3 years ago
Best ResponseYou've already chosen the best response.1Note that here: Solve this system  Just add them. 3y  2z = 4 y+ 2z=4  I excluded the 0x term. It is just a placeholder of sorts.

Directrix
 3 years ago
Best ResponseYou've already chosen the best response.12y = 0 y= 0/2 y = 0> You have division by 0 and division into 0 mixed up.

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0okay i got that step right.

Directrix
 3 years ago
Best ResponseYou've already chosen the best response.1It is wrong. But, unless you show your steps, I cannot help you find the error.

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0i got it right! x=1 y=0 z=2 ! =]

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0thanks so much! i really aprreciate it!
Ask your own question
Sign UpFind more explanations on OpenStudy
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.