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How to solve a system of linear equations ?

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Sudo
Sudo 2013-3-5
Hi,how can i solve this system in Mupad and get only the positive real solutions.
x + y + z = 50
5x + y + 0.1z = 50
Thank You :)

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采纳的回答

Friedrich
Friedrich 2013-3-6
编辑：Friedrich 2013-3-6
Hi,
You have 3 degrees of freedom and 2 eqations, so there is NO unique solution.
So doing some basic math gives:
z free to choose and
x = 0.225*z
y = 50 - 1.225*z
So when you choose z to be 40 you get x = 9 and y = 1.

更多回答（1 个）

Azzi Abdelmalek
Azzi Abdelmalek 2013-3-5
sol=[1 1 1;5 1 0.1]\[50;50]
  2 个评论
Sudo
Sudo 2013-3-6
this doesn't give a real solution.the solution i want should be 9,1 and 40.
Youssef Khmou
Youssef Khmou 2013-3-6
hi :
a=[1 1 1;5 1 0.1]
b=[50 50]';
sol=pinv(a)*b; %Pseudo inverse

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