Results 1 to 5 of 5

Math Help - solve linear system

  1. #1
    Newbie
    Joined
    Jun 2008
    From
    canada
    Posts
    10

    solve linear system

    solve and check

    a+b+3c=12
    2a+b+3c=14
    a-b+4c=13


    please help me as soon as possible.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Junior Member
    Joined
    Jun 2008
    Posts
    44
    Quote Originally Posted by nipun View Post
    solve and check

    a+b+3c=12
    2a+b+3c=14
    a-b+4c=13


    please help me as soon as possible.

    did u try to find the value of each variables which is a,b and c?

    wat did i got is

    a=2
    b=1
    c=3
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Jun 2008
    From
    canada
    Posts
    10
    how did you get the value of a,b, and c

    can you plese tell me how did you find it?
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Super Member flyingsquirrel's Avatar
    Joined
    Apr 2008
    Posts
    802
    Hi
    solve and check

    a+b+3c=12
    2a+b+3c=14
    a-b+4c=13


    please help me as soon as possible.
    \left\{ \begin{tabular}{lr}<br />
a+b+3c=12 & (1)\\<br />
2a+b+3c=14 & (2)\\<br />
a-b+4c=13 &(3)<br />
\end{tabular}\right.

    (2)-(1) gives us the value of a then (2)+(3) gives us the value of c and finally (1) gives us the value of b.
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Junior Member
    Joined
    Jun 2008
    Posts
    44
    Quote Originally Posted by nipun View Post
    how did you get the value of a,b, and c

    can you plese tell me how did you find it?
    lets say

    a+b+3c=12 (1)
    2a+b+3c=14 (2)
    a-b+4c=13 (3)

    step 1

    equation (1)-equation (3)

    u will get
    c=1+2b (4)

    step 2
    equation (1) multiply by 2

    u will get: 2a+2b+6c=24 (5)

    thus:

    equation (5) -equation (2) and u will get;

    b=10-3c

    substitute b=10-3c into equation (4) and u will get the value of c

    since one variables is known then it will easy to determine others
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. solve - Non-linear System of equations
    Posted in the Pre-Calculus Forum
    Replies: 2
    Last Post: July 2nd 2010, 03:14 AM
  2. Replies: 1
    Last Post: March 25th 2010, 02:54 PM
  3. Solve the linear system.
    Posted in the Algebra Forum
    Replies: 1
    Last Post: March 17th 2009, 04:49 PM
  4. how to solve for a_k in this linear system ?
    Posted in the Advanced Algebra Forum
    Replies: 0
    Last Post: February 25th 2009, 03:06 PM
  5. help me solve this system of linear equation.
    Posted in the Algebra Forum
    Replies: 2
    Last Post: December 4th 2008, 01:49 PM

Search Tags


/mathhelpforum @mathhelpforum