Trying to solve 4 equation with 4 unknowns
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omercan demirel
on 10 Oct 2015
Commented: Tamara
on 2 Aug 2022
Hello,
I am trying to solve this problem:
2a + 1b + 0c + 6d = 64
5a + 2b + 0c + 0d = 37
0a + 7b + 2c + 2d = 66
0a + 0b + 8c + 9d = 104
So I wrote this code:
clear;
clc;
equation1=64-2*a-b-6*d;
equation2=37-5*a-2*b;
equation3=66-7*b-2*c-2*d;
equation4=104-8*c-9*d;
sol=solve(equation1,equation2,equation3,equation4);
But it gives Undefined function or variable 'a' in line 3. I know I am missing something very obvious but I cannot find it. Could you help me?
Thank you.
3 Comments
Yashas Kumar G B
on 10 Oct 2020
It's easier than all discription which can easily understood by students . By seeing that we can get general syntax of problem of such typee
Tamara
on 2 Aug 2022
x + y + z + w = 10.3 2x - 7y + z - w = -1.5 -X - 3y - z + w = -6.9 3x + z - w = 2.4
Accepted Answer
Walter Roberson
on 10 Oct 2015
syms a b c d
equation1=64-2*a-b-6*d;
equation2=37-5*a-2*b;
equation3=66-7*b-2*c-2*d;
equation4=104-8*c-9*d;
sol=solve(equation1,equation2,equation3,equation4);
3 Comments
Walter Roberson
on 10 Oct 2015
Is that a problem? You asked for a symbolic solution and you received a symbolic solution. You can look at the individual solutions with, for example,
sol.a
More Answers (1)
Liang Wei Teo
on 10 Oct 2015
you can try changing everything to matrix and solve it using Ax=b
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